√口算批改 口算基础过关 对( )题 ____分____秒
24 + 16 = 186 + 204 = 285×10 = 4×(2 + 11) =
52 + 28 = 3600÷40 = 47×200 = (17 + 8)÷5 =
161 + 233 = 2700 + 130 = 976 - 331 = 23 + 44 + 17 =
24 + 16 = 186 + 204 = 285×10 = 4×(2 + 11) =
52 + 28 = 3600÷40 = 47×200 = (17 + 8)÷5 =
161 + 233 = 2700 + 130 = 976 - 331 = 23 + 44 + 17 =
答案:
40 390 2850 52 80 90 9400 5
394 2830 645 84
394 2830 645 84
计算能力提升 对( )题 ____分____秒
1. 根据加法运算律,在 里填上适当的数。
27 + 32 = 32 + ____ 45 + 36 + 64 = 45 + (______ + ______)
600 + 36 = ____ + 600 560 + (140 + 70) = (560 + ______) + ____
39 + ____ = 26 + ____ ____ + 31 + ______ = 67 + (______ + 29)
1. 根据加法运算律,在 里填上适当的数。
27 + 32 = 32 + ____ 45 + 36 + 64 = 45 + (______ + ______)
600 + 36 = ____ + 600 560 + (140 + 70) = (560 + ______) + ____
39 + ____ = 26 + ____ ____ + 31 + ______ = 67 + (______ + 29)
答案:
1. 27 36 64 36 140 70
26 39 67 29 31
26 39 67 29 31
2. 计算下面各题,并用加法交换律验算。
279 + 321 = 468 + 223 = 570 + 286 =
1026 + 375 = 38 + 479 = 117 + 1046 =
279 + 321 = 468 + 223 = 570 + 286 =
1026 + 375 = 38 + 479 = 117 + 1046 =
答案:
2. 600 691 856 1401 517 1163
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