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四年级上册

四年级上册. 乘法. 口算，直接说结果. 130×5= 2×380= 150×6= 18×3= 23×4= 7×13= 460×2= 7×50=. 估算. 59×103 ≈ 720×12≈ 315×72≈ 408×18 ≈ 209×29≈. 填空. 一个因数扩大 2 倍，另一个因数不变，积（ ）. 一个因数扩大 4 倍，另一个因数扩大 3 倍，积（ ）.

philip-mclaughlin
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四年级上册

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  1. 四年级上册 乘法

  2. 口算，直接说结果 130×5= 2×380= 150×6= 18×3= 23×4= 7×13= 460×2= 7×50=

  3. 估算 59×103 ≈ 720×12≈ 315×72≈ 408×18 ≈ 209×29≈

  4. 填空 一个因数扩大2倍，另一个因数不变，积（ ） 一个因数扩大4倍，另一个因数扩大3倍，积（ ） 一个因数缩小5倍，另一个因数缩小4倍，积（ ） 一个因数缩小5倍，另一个因数扩大10倍，积（ ） 一个因数扩大2倍，另一个因数缩小16倍，积（ ）

  5. 笔算 245×27 = 530×48= 509×50= 802×37=

  6. 解决问题

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