内容正文:
第 一 单 元 小数乘法
7
4. 整数乘法运算定律推广到小数(一)
根据运算定律填空。
1 0.4×2.1 = ×0.4
2 4.2×2.04 = 2.04×
3 2.25×2.3×0.25 = 2.25×( × )
4 40.5×25.6×10.4 = ×( × )
5 2.8×(3.08×5.39)= × ×
6 60.05×6.4+60.05×3.6 = ×( + )
7 100×(2.5+60.5)= × + ×
8 (101.2-6.2)×50 = × - ×
9 9.65×(75.8-2.47)= × - ×
五年级数学上册口 算 天 天 练
8
4. 整数乘法运算定律推广到小数(二)
根据运算定律填空。
1 10.5×3.6 = ×
2 (12.3×4)×2.5 = ×( ×2.5)
3 (8 + 0.4)×25 = ×25 + ×25
4 8.75×11-8.75 = ×( - )
5 3.42×5.7 + 4.3×3.42 = ×( + )
6 3.26×5.7-3.26×0.7 = ×( - )
7 6.25×99 + 6.25 = 6.25×( + )= 6.25×
8 (10-0.8)×124 = × - ×
9 55.6×101-55.6 = 55.6×( - )= 55.6×
第 一 单 元 小数乘法
9
(一)
看谁算得又对又快。
1 0.5×50 = 2 40×0.7 = 3 0.42×4 =
4 45×2.2 = 5 15×7.5 = 6 0.25×45 =
7 24×2.6 = 8 3.5×1.2 = 9 1.25×7.5 =
10 2.5×3.2 = 11 0.2×2.5 = 12 2.06×0.8 =
13 4.9×4.4 = 14 4.8×0.8 = 15 4.08×1.6 =
16 3.8×1.4 = 17 1.7×0.4 = 18 0.01×3.1 =
19 75×0.8 = 20 0.9×4.8 = 21 1.88×2.5 =
22 20×1.2 = 23 4.6×3.2 = 24 3.25×0.9 =
25 1.6×2.5 = 26 0.3×5.5 = 27 5.55×0.5 =
五年级数学上册口 算 天 天 练
10
(二)
看谁算得又对又快。
1 25×0.5 = 2 0.3×0.8 = 3 0.04×50 =
4 7×1.9 = 5 0.17×3.2 = 6 0.25×0.5 =
7 2.8×0.4 = 8 3.2×0.3 = 9 1.01×9.9 =
10 0.9×1.7 = 11 7.5×0.4 = 12 3.2×0.6 =
13 8×0.75 = 14 3.6×0.9 = 15 0.125×8 =
16 3.3×3.3 = 17 101×4.5 = 18 2.4×1.1 =
19 0.5×1.8 = 20 22.5×0.2 = 21 0.01×0.4 =
22 1.8×2.5 = 23 300×0.5 = 24 6.8×2.5 =
25 40×2.5 = 26 4.08×5 = 27 305×0.01 =
第 一 单 元 小数乘法
11
(三)
看谁算得又对又快。
1 0.35×1.5 = 2 5.1×1.5 = 3 6.5×0.2 =
4 0.3×0.7 = 5 0.62×0.3 = 6 2.1×4.5 =
7 3.2×0.4 = 8 0.7×1.2 = 9 5.05×10 =
10 0.62×0.1 = 11 3.3×2.2 = 12 4.3×0.3 =
13 99×4.1 = 14 0.4×0.1 = 15 0.04×1.6 =
16 1.25×4.4 = 17 6.2×0.2 = 18 2.34×0.