工作就用美篇工作版","guide_search_desc":"海量模板范文,一键做同款 工作就用美篇工作版","img_beautify_switch":0,"ad_free":0,"text_direction":1,"template":{"id":9105,"series_id":18,"theme_id":18},"container":{},"redirect":{"redirect_type":1,"img_url":false,"link_url":"/wap/downloadpage/backpage","button_bg_color":false,"button_desc":false,"redirect_desc":false},"edit_date_str":"更新于 2020-10-19","current_time":1744095437,"font_name":"","rcmd_meipian":0,"hide_article_link":0,"from_wechat":false,"topk_keywords":[{"name":"数学","score":0.214771},{"name":"研究","score":0.205378},{"name":"黄豆","score":0.182098},{"name":"亿颗","score":0.165094},{"name":"探究","score":0.159481},{"name":"亿有","score":0.149435},{"name":"亿步","score":0.149435},{"name":"画个","score":0.149435},{"name":"亿个","score":0.131244},{"name":"同学","score":0.126107}],"music_name":"","origin_status":0,"password_v2":"","font_id":0,"title_style":"","rich_text_title":"","enable_download":1,"cover_thumb":"https://ss-mpvolc.meipian.me/users/40452407/4e79943ea5374e9304e15a29d8685022_crop__jpg.heic","has_video":false,"gift_switch":1,"enable_watermark":1,"content":{"article_id":251338023,"content":[{"audio_music_id":0,"source":0,"text":"
1亿有多大?
","type":1},{"audio_music_id":0,"source":0,"text":"——自由路小学四年级数学实践活动
","type":1},{"audio_music_id":0,"source":0,"text":" 在你的心目中,1亿有多大呢?学习了《大数的认识》后,为了让同学们体验1亿的大小,培养学生的数感,感受数学与生活的密切联系,自由路小学四年级的数学老师们引导同学们经历猜想、实验、推理和对照的过程,对“1亿有多大”进行了深入的探究。
","type":1},{"audio_music_id":0,"img_height":700,"img_size":107,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/4e79943ea5374e9304e15a29d8685022__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNGU3OTk0M2VhNTM3NGU5MzA0ZTE1YTI5ZDg2ODUwMjJfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":" 课堂上的提问:你知道1亿有多大吗?一石激起千层浪,同学们凭借已有的知识和生活经验纷纷猜想:1亿粒大米能装满1间房子,走1亿步可以绕咱们安阳市一周,1亿颗糖有1吨重,读1亿个字需要2个月的时间,1亿本书垒起来可能有一座山那么高……真的是这样吗?大家对1亿这个数的大小充满了好奇心。
实践出真知,在老师的指导和家长的帮助下,同学们选定研究主题,确定研究方案,进行实验探究。
","type":1},{"audio_music_id":0,"source":0,"text":"探究一:我从质量上研究
","type":1},{"audio_music_id":0,"img_height":1600,"img_size":595,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/3e5ff5dfd81ada6e62f14beb5bcfd9c2__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】1亿颗黄豆有多重?
【研究过程】
要测量1亿颗黄豆的质量显然是不现实的,那怎么办呢?我们可以先测量一部分,再推算出整体是多少,确定了化繁为简、以小推大的研究思想和方法。
先数出100颗黄豆并称重,大约是25克,那么1000颗黄豆250克,10000颗黄豆2500克,……,进一步推算1亿颗黄豆是25000000克,也就是25吨。
【研究结论】
1亿颗黄豆竟重达25吨,大约是6头大象的体重,相当于500个50公斤的人的体重,大约是1000袋面粉的重量。
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvM2U1ZmY1ZGZkODFhZGE2ZTYyZjE0YmViNWJjZmQ5YzJfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":568,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/0a23c68b2ad48abde45da417ce6dfcc1__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMGEyM2M2OGIyYWQ0OGFiZGU0NWRhNDE3Y2U2ZGZjYzFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":834,"img_size":128,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/db4f67a8ff1bb3bf524795caf26d2b26__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZGI0ZjY3YThmZjFiYjNiZjUyNDc5NWNhZjI2ZDJiMjZfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":838,"img_size":115,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/a560be9ad20f6736fc4e62e25226ad04__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvYTU2MGJlOWFkMjBmNjczNmZjNGU2MmUyNTIyNmFkMDRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":205,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/e8f7e892d543fdd7a920630530b8f3d3__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZThmN2U4OTJkNTQzZmRkN2E5MjA2MzA1MzBiOGYzZDNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":168,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/0a550cd3502220f6e3d66103c6627703__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMGE1NTBjZDM1MDIyMjBmNmUzZDY2MTAzYzY2Mjc3MDNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":142,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/bf3e68ea763f9a5cf4c0bdfeeb7065dc__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvYmYzZTY4ZWE3NjNmOWE1Y2Y0YzBiZGZlZWI3MDY1ZGNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":181,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/cfd57801529feaee4d833846f40bdf20__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvY2ZkNTc4MDE1MjlmZWFlZTRkODMzODQ2ZjQwYmRmMjBfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":"探究二:我从高度上研究
","type":1},{"audio_music_id":0,"img_height":1598,"img_size":525,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/6b3b1c65b48ed1ca06d261c30c5f44ba__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】1亿本数学书摞起来有多高?
【研究过程】
先测量出1本数学书的厚度大约是5毫米,那么10本数学书就是50毫米,100本数学书500毫米,……,进一步推算1亿本数学书约是500000000毫米,也就是500千米。
【研究结论】
我国最高峰珠穆朗玛峰高度是8844.44米,1亿本数学书摞在一起的高度500千米竟然相当于56个珠穆朗玛峰的高度。
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNmIzYjFjNjViNDhlZDFjYTA2ZDI2MWMzMGM1ZjQ0YmFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":497,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/750844c34bcd2ca7c8ec8f4461846fbd__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNzUwODQ0YzM0YmNkMmNhN2M4ZWM4ZjQ0NjE4NDZmYmRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":505,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/ba727923f4d63f7658ba80c932c75ecd__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvYmE3Mjc5MjNmNGQ2M2Y3NjU4YmE4MGM5MzJjNzVlY2RfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":902,"img_size":503,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/f3cbc2c01c1742b368732ad3cd461d64__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZjNjYmMyYzAxYzE3NDJiMzY4NzMyYWQzY2Q0NjFkNjRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":578,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/2198d12c4c0865921e691699b855d343__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMjE5OGQxMmM0YzA4NjU5MjFlNjkxNjk5Yjg1NWQzNDNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":180,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/df26fcc1fae6adeec84c9d12800329d9__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZGYyNmZjYzFmYWU2YWRlZWM4NGM5ZDEyODAwMzI5ZDlfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":214,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/0f6e58518d493938f6b2e0d8704c3661__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMGY2ZTU4NTE4ZDQ5MzkzOGY2YjJlMGQ4NzA0YzM2NjFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":"探究三:我从长度上研究
","type":1},{"audio_music_id":0,"img_height":1696,"img_size":470,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/1e635fd6c5e2a26b0931cea55fa71271__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】走1亿步能走多远?
【研究过程】
先测量走一步的距离,大约80厘米;也可以使用手机软件帮助计量,基数越大,计量越准确。走1000步,路程约800米,用时约10分钟,由此推算走10000步,路程约8000米,用时约100分钟,……,走1亿步,路程约80000千米,用时约1000000分钟≈16667小时≈694天≈2年。
【研究结论】
走1亿步大约80000千米,安阳到上海的距离约为1000千米,走1亿步相当于安阳市到上海市之间40个来回,不吃不喝不睡连续走近2年才能走完!
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMWU2MzVmZDZjNWUyYTI2YjA5MzFjZWE1NWZhNzEyNzFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":902,"img_size":750,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/328e50a88885cf6540cb1f5b4820bd94__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMzI4ZTUwYTg4ODg1Y2Y2NTQwY2IxZjViNDgyMGJkOTRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":155,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/4a9cc747299f3b9c6e2c4398710bfc60__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNGE5Y2M3NDcyOTlmM2I5YzZlMmM0Mzk4NzEwYmZjNjBfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":170,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/f97da04d2674de9cbc12bcf6eb334c84__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZjk3ZGEwNGQyNjc0ZGU5Y2JjMTJiY2Y2ZWIzMzRjODRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":2000,"img_size":502,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/d900e0e6f04061c6e8d41e1cdd4cfab7__jpg.heic","img_width":2880,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZDkwMGUwZTZmMDQwNjFjNmU4ZDQxZTFjZGQ0Y2ZhYjdfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":"探究四:我从时间上研究
","type":1},{"audio_music_id":0,"img_height":1700,"img_size":624,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/f0a8044f3114a2b3c0297ccc5212faf8__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】画1亿个点需要多长时间?
【研究过程】
假设画1个点的时间是1秒,那么1分钟可以画60个点,1小时可以画3600个点,1天可以画86400个点,画1亿个点需要的时间为100000000÷86400≈1157.4天≈3年2个月
【研究结论】
1秒画1个点,要想画1亿个点,即使连续不停地画,3年2个月之后才能画完呢!
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在实践过程中,同学们经历了测量数据-实验推算-获得结论的实验过程,掌握了探究的方法,积累了数学活动经验。小小的黄豆、薄薄的课本、短短的步子、短暂的一秒,看起来毫不起眼,滴水成河、粒米成箩,当它们积少成多达到1亿时,竟然质量如此之重、高度如此之高、距离如此之远、时间如此之长。
此外,1亿的例子还有很多:1亿个小学生手拉手可以环绕地球赤道3圈半,1亿滴水相当于20万瓶矿泉水,可供贫困地区的一个人用3年,1亿粒大米够一个人吃16年,可供3.5万人填饱肚子……同学们感叹1亿这个数可真大的同时,也受到了勤俭节约、珍惜时间的思想教育。
“1亿有多大”的实践活动让数学回归生活,让同学们积累了数学活动经验,获得了成功的喜悦,增强了大家学好数学、用好数学的信心。
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","type":1},{"audio_music_id":0,"source":0,"text":"——自由路小学四年级数学实践活动
","type":1},{"audio_music_id":0,"source":0,"text":" 在你的心目中,1亿有多大呢?学习了《大数的认识》后,为了让同学们体验1亿的大小,培养学生的数感,感受数学与生活的密切联系,自由路小学四年级的数学老师们引导同学们经历猜想、实验、推理和对照的过程,对“1亿有多大”进行了深入的探究。
","type":1},{"audio_music_id":0,"img_height":700,"img_size":107,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/4e79943ea5374e9304e15a29d8685022__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNGU3OTk0M2VhNTM3NGU5MzA0ZTE1YTI5ZDg2ODUwMjJfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":" 课堂上的提问:你知道1亿有多大吗?一石激起千层浪,同学们凭借已有的知识和生活经验纷纷猜想:1亿粒大米能装满1间房子,走1亿步可以绕咱们安阳市一周,1亿颗糖有1吨重,读1亿个字需要2个月的时间,1亿本书垒起来可能有一座山那么高……真的是这样吗?大家对1亿这个数的大小充满了好奇心。
实践出真知,在老师的指导和家长的帮助下,同学们选定研究主题,确定研究方案,进行实验探究。
","type":1},{"audio_music_id":0,"source":0,"text":"探究一:我从质量上研究
","type":1},{"audio_music_id":0,"img_height":1600,"img_size":595,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/3e5ff5dfd81ada6e62f14beb5bcfd9c2__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】1亿颗黄豆有多重?
【研究过程】
要测量1亿颗黄豆的质量显然是不现实的,那怎么办呢?我们可以先测量一部分,再推算出整体是多少,确定了化繁为简、以小推大的研究思想和方法。
先数出100颗黄豆并称重,大约是25克,那么1000颗黄豆250克,10000颗黄豆2500克,……,进一步推算1亿颗黄豆是25000000克,也就是25吨。
【研究结论】
1亿颗黄豆竟重达25吨,大约是6头大象的体重,相当于500个50公斤的人的体重,大约是1000袋面粉的重量。
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvM2U1ZmY1ZGZkODFhZGE2ZTYyZjE0YmViNWJjZmQ5YzJfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":568,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/0a23c68b2ad48abde45da417ce6dfcc1__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMGEyM2M2OGIyYWQ0OGFiZGU0NWRhNDE3Y2U2ZGZjYzFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":834,"img_size":128,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/db4f67a8ff1bb3bf524795caf26d2b26__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZGI0ZjY3YThmZjFiYjNiZjUyNDc5NWNhZjI2ZDJiMjZfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":838,"img_size":115,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/a560be9ad20f6736fc4e62e25226ad04__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvYTU2MGJlOWFkMjBmNjczNmZjNGU2MmUyNTIyNmFkMDRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":205,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/e8f7e892d543fdd7a920630530b8f3d3__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZThmN2U4OTJkNTQzZmRkN2E5MjA2MzA1MzBiOGYzZDNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":168,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/0a550cd3502220f6e3d66103c6627703__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMGE1NTBjZDM1MDIyMjBmNmUzZDY2MTAzYzY2Mjc3MDNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":142,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/bf3e68ea763f9a5cf4c0bdfeeb7065dc__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvYmYzZTY4ZWE3NjNmOWE1Y2Y0YzBiZGZlZWI3MDY1ZGNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":181,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/cfd57801529feaee4d833846f40bdf20__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvY2ZkNTc4MDE1MjlmZWFlZTRkODMzODQ2ZjQwYmRmMjBfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":"探究二:我从高度上研究
","type":1},{"audio_music_id":0,"img_height":1598,"img_size":525,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/6b3b1c65b48ed1ca06d261c30c5f44ba__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】1亿本数学书摞起来有多高?
【研究过程】
先测量出1本数学书的厚度大约是5毫米,那么10本数学书就是50毫米,100本数学书500毫米,……,进一步推算1亿本数学书约是500000000毫米,也就是500千米。
【研究结论】
我国最高峰珠穆朗玛峰高度是8844.44米,1亿本数学书摞在一起的高度500千米竟然相当于56个珠穆朗玛峰的高度。
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNmIzYjFjNjViNDhlZDFjYTA2ZDI2MWMzMGM1ZjQ0YmFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":497,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/750844c34bcd2ca7c8ec8f4461846fbd__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNzUwODQ0YzM0YmNkMmNhN2M4ZWM4ZjQ0NjE4NDZmYmRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":505,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/ba727923f4d63f7658ba80c932c75ecd__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvYmE3Mjc5MjNmNGQ2M2Y3NjU4YmE4MGM5MzJjNzVlY2RfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":902,"img_size":503,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/f3cbc2c01c1742b368732ad3cd461d64__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZjNjYmMyYzAxYzE3NDJiMzY4NzMyYWQzY2Q0NjFkNjRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1598,"img_size":578,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/2198d12c4c0865921e691699b855d343__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMjE5OGQxMmM0YzA4NjU5MjFlNjkxNjk5Yjg1NWQzNDNfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":180,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/df26fcc1fae6adeec84c9d12800329d9__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZGYyNmZjYzFmYWU2YWRlZWM4NGM5ZDEyODAwMzI5ZDlfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":214,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/0f6e58518d493938f6b2e0d8704c3661__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMGY2ZTU4NTE4ZDQ5MzkzOGY2YjJlMGQ4NzA0YzM2NjFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":"探究三:我从长度上研究
","type":1},{"audio_music_id":0,"img_height":1696,"img_size":470,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/1e635fd6c5e2a26b0931cea55fa71271__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】走1亿步能走多远?
【研究过程】
先测量走一步的距离,大约80厘米;也可以使用手机软件帮助计量,基数越大,计量越准确。走1000步,路程约800米,用时约10分钟,由此推算走10000步,路程约8000米,用时约100分钟,……,走1亿步,路程约80000千米,用时约1000000分钟≈16667小时≈694天≈2年。
【研究结论】
走1亿步大约80000千米,安阳到上海的距离约为1000千米,走1亿步相当于安阳市到上海市之间40个来回,不吃不喝不睡连续走近2年才能走完!
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMWU2MzVmZDZjNWUyYTI2YjA5MzFjZWE1NWZhNzEyNzFfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":902,"img_size":750,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/328e50a88885cf6540cb1f5b4820bd94__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvMzI4ZTUwYTg4ODg1Y2Y2NTQwY2IxZjViNDgyMGJkOTRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":155,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/4a9cc747299f3b9c6e2c4398710bfc60__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvNGE5Y2M3NDcyOTlmM2I5YzZlMmM0Mzk4NzEwYmZjNjBfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":1800,"img_size":170,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/f97da04d2674de9cbc12bcf6eb334c84__jpg.heic","img_width":1200,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZjk3ZGEwNGQyNjc0ZGU5Y2JjMTJiY2Y2ZWIzMzRjODRfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"img_height":2000,"img_size":502,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/d900e0e6f04061c6e8d41e1cdd4cfab7__jpg.heic","img_width":2880,"is_origin":false,"source":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNDA0NTI0MDcvZDkwMGUwZTZmMDQwNjFjNmU4ZDQxZTFjZGQ0Y2ZhYjdfX2pwZy5oZWlj/nickname/c29uZ2dl/userid/NDA0NTI0MDc=/sign/32a20098e76cace06c07f6a0d45e5e16"},{"audio_music_id":0,"source":0,"text":"探究四:我从时间上研究
","type":1},{"audio_music_id":0,"img_height":1700,"img_size":624,"img_url":"https://ss-mpvolc.meipian.me/users/40452407/f0a8044f3114a2b3c0297ccc5212faf8__jpg.heic","img_width":1200,"is_origin":false,"source":0,"text":"【研究主题】画1亿个点需要多长时间?
【研究过程】
假设画1个点的时间是1秒,那么1分钟可以画60个点,1小时可以画3600个点,1天可以画86400个点,画1亿个点需要的时间为100000000÷86400≈1157.4天≈3年2个月
【研究结论】
1秒画1个点,要想画1亿个点,即使连续不停地画,3年2个月之后才能画完呢!
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在实践过程中,同学们经历了测量数据-实验推算-获得结论的实验过程,掌握了探究的方法,积累了数学活动经验。小小的黄豆、薄薄的课本、短短的步子、短暂的一秒,看起来毫不起眼,滴水成河、粒米成箩,当它们积少成多达到1亿时,竟然质量如此之重、高度如此之高、距离如此之远、时间如此之长。
此外,1亿的例子还有很多:1亿个小学生手拉手可以环绕地球赤道3圈半,1亿滴水相当于20万瓶矿泉水,可供贫困地区的一个人用3年,1亿粒大米够一个人吃16年,可供3.5万人填饱肚子……同学们感叹1亿这个数可真大的同时,也受到了勤俭节约、珍惜时间的思想教育。
“1亿有多大”的实践活动让数学回归生活,让同学们积累了数学活动经验,获得了成功的喜悦,增强了大家学好数学、用好数学的信心。
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