内容正文:
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倍数应用题初步
1
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引入
大家猜一猜老师的体重?是你体重的多少倍?
2
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预习1
1、填空。
下图中有 _____ 个圆,有 _____ 个正方形;正方形的个数是圆的 _____倍。
注意:
倍不能做单位!
2
6
3
3
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预习2
2、已知三角形的数量是正方形的 2 倍,你能在虚线框中画出相应数量的三角形吗?
4
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预习3
3、已知圆的数量是正方形的 4 倍,你能在虚线框中画出相应数量的正方形吗?
5
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例题1
(1)根据线段图计算柳树有多少棵。
(2)根据题意画出线段图,并解答。
小新和小芳比赛摘草莓,小芳摘了 7 个,小新摘的草莓的数量是小芳的 3 倍。小新摘了多少个草莓?
总结:一倍量×倍数=多倍量。
(1)柳树:5 × 3 = 15(棵)
小新:7 × 3 = 21(个)
答:柳树有 1