四年级数学简便计算 题及答案
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4） 13 × 99 = 1 3 ×( 1 0 0 － 1 ) =1300－ 13 = 1287
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1 7） 34 × 3 5 3 5 － 3 5 × 3 43 4 = 3 4 ×3 5 ×1 0 1 － 3 5 ×3 4 ×1 0 1 =0
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四年级数学 简便计算 题及答案:
1 ） 1 2 5 ×（ 1 7 × 8 ） × 4 = 1 2 5 ×8 ×4 ×1 7 = 1 0 0 0 ×6 8 = 68000
2） 375 × 480 + 6250 × 48 = 4 8 0 ×( 3 7 5 ＋ 6 2 5 ) = 480000
3 ） 2 5 × 1 6 ×1 2 5 = 2 5 ×2wenku.baidu.com×8 ×1 2 5 = 50000
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= 222221777778
14） 333333 × 333333 = 1 1 1 1 1 1 ×9 9 9 9 9 9 = 1 1 1 1 1 1 ×( 1 0 0 0 0 0 0 － 1 ) = 111111000000－ 111111 = 111110888889
1 5） 56 0 0 0 ÷ （ 1 4 0 0 0 ÷ 16 ） = 5 6 0 0 0 ÷1 4 0 0 0 ×1 6 = 4 ×1 6 = 64
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8 ） 5 6 0 0 ÷（ 2 5 ×7 ） = 5 6 ×1 0 0 ÷2 5 ÷7 = 5 6 ÷7 ×1 0 0 ÷2 5 = 32
9） 210 ÷ 42 × 6 = 2 1 0 ÷7 ÷6 ×6
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1 6 ） 6 5 4 3 2 1 × 9 0 9 0 9 0 + 6 5 4 3 2 1 ×9 0 9 0 9 = 6 5 4 3 2 1 ×9 9 9 9 9 9 = 6 5 4 3 2 1 ×( 1 0 0 0 0 0 － 1 ) = 654321000000－ 654321 = 654320345679
2 0） 34 7 + 3 5 8 + 3 5 2 + 3 49 = 3 5 0 ×4 － 3 + 8 + 2 － 1 = 1400+ 6 = 1406
2 1） 75 × 4 5 + 1 7 × 2 5 = 2 5 ×3 ×4 5 + 1 7 ×2 5 = 2 5 ×( 1 3 5 + 1 7 ) = 2 5 ×1 5 2 = 2 5 ×4 ×3 8 = 3800
5） 75000 ÷ 125 ÷ 15 = 7 5 ×1 0 0 0 ÷1 2 5 ÷1 5 = 7 5 ÷1 5 ×1 0 0 0 ÷1 2 5 = 5 ×8 = 40
6） 7900 ÷ 4 ÷ 25 = 7 9 0 0 ÷( 4 ×2 5 ) = 79
7） 150 × 40 ÷ 50 = 1 5 0 ÷5 0 ×4 0 = 3 ×4 0 = 120
1 8） 27 0 0 0 ÷ 1 2 5 = 2 7 ×1 0 0 0 ÷1 2 5 = 2 7 ×8 = 216
1 9） 34 5 3 4 5 ÷ 1 50 1 5 = 3 4 5 ×1 0 0 1 ÷( 1 5 ×1 0 0 1 ) = 3 4 5 ÷1 5 ×1 0 0 1 ÷1 0 0 1 = 23
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1 2） 32 1 × 8 1 + 3 2 1 × 19 = 3 2 1 ×( 8 1 + 1 9 ) = 32100
1 3） 22 2 2 2 2 × 9 99 9 99 = 2 2 2 2 2 2 ×( 1 0 0 0 0 0 0 － 1 ) = 222222000000－ 222222
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= 30
1 0） 39 6 0 0 ÷ 2 5 = 3 9 6 ×1 0 0 ÷2 5 = 3 9 6 ×4 = 1584
1 1） 67 × 2 1 ＋ 1 8 × 2 1 + 8 5 × 79 = 2 1 ×( 6 7 + 1 8 ) + 8 5 ×7 9 = 2 1 ×8 5 + 8 5 ×7 9 = 8 5 ×( 2 1 + 7 9 ) = 8500
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1 7） 34 × 3 5 3 5 － 3 5 × 3 43 4 = 3 4 ×3 5 ×1 0 1 － 3 5 ×3 4 ×1 0 1 =0
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四年级数学 简便计算 题及答案:
1 ） 1 2 5 ×（ 1 7 × 8 ） × 4 = 1 2 5 ×8 ×4 ×1 7 = 1 0 0 0 ×6 8 = 68000
2） 375 × 480 + 6250 × 48 = 4 8 0 ×( 3 7 5 ＋ 6 2 5 ) = 480000
3 ） 2 5 × 1 6 ×1 2 5 = 2 5 ×2wenku.baidu.com×8 ×1 2 5 = 50000
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= 222221777778
14） 333333 × 333333 = 1 1 1 1 1 1 ×9 9 9 9 9 9 = 1 1 1 1 1 1 ×( 1 0 0 0 0 0 0 － 1 ) = 111111000000－ 111111 = 111110888889
1 5） 56 0 0 0 ÷ （ 1 4 0 0 0 ÷ 16 ） = 5 6 0 0 0 ÷1 4 0 0 0 ×1 6 = 4 ×1 6 = 64
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8 ） 5 6 0 0 ÷（ 2 5 ×7 ） = 5 6 ×1 0 0 ÷2 5 ÷7 = 5 6 ÷7 ×1 0 0 ÷2 5 = 32
9） 210 ÷ 42 × 6 = 2 1 0 ÷7 ÷6 ×6
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1 6 ） 6 5 4 3 2 1 × 9 0 9 0 9 0 + 6 5 4 3 2 1 ×9 0 9 0 9 = 6 5 4 3 2 1 ×9 9 9 9 9 9 = 6 5 4 3 2 1 ×( 1 0 0 0 0 0 － 1 ) = 654321000000－ 654321 = 654320345679
2 0） 34 7 + 3 5 8 + 3 5 2 + 3 49 = 3 5 0 ×4 － 3 + 8 + 2 － 1 = 1400+ 6 = 1406
2 1） 75 × 4 5 + 1 7 × 2 5 = 2 5 ×3 ×4 5 + 1 7 ×2 5 = 2 5 ×( 1 3 5 + 1 7 ) = 2 5 ×1 5 2 = 2 5 ×4 ×3 8 = 3800
5） 75000 ÷ 125 ÷ 15 = 7 5 ×1 0 0 0 ÷1 2 5 ÷1 5 = 7 5 ÷1 5 ×1 0 0 0 ÷1 2 5 = 5 ×8 = 40
6） 7900 ÷ 4 ÷ 25 = 7 9 0 0 ÷( 4 ×2 5 ) = 79
7） 150 × 40 ÷ 50 = 1 5 0 ÷5 0 ×4 0 = 3 ×4 0 = 120
1 8） 27 0 0 0 ÷ 1 2 5 = 2 7 ×1 0 0 0 ÷1 2 5 = 2 7 ×8 = 216
1 9） 34 5 3 4 5 ÷ 1 50 1 5 = 3 4 5 ×1 0 0 1 ÷( 1 5 ×1 0 0 1 ) = 3 4 5 ÷1 5 ×1 0 0 1 ÷1 0 0 1 = 23
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1 2） 32 1 × 8 1 + 3 2 1 × 19 = 3 2 1 ×( 8 1 + 1 9 ) = 32100
1 3） 22 2 2 2 2 × 9 99 9 99 = 2 2 2 2 2 2 ×( 1 0 0 0 0 0 0 － 1 ) = 222222000000－ 222222
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= 30
1 0） 39 6 0 0 ÷ 2 5 = 3 9 6 ×1 0 0 ÷2 5 = 3 9 6 ×4 = 1584
1 1） 67 × 2 1 ＋ 1 8 × 2 1 + 8 5 × 79 = 2 1 ×( 6 7 + 1 8 ) + 8 5 ×7 9 = 2 1 ×8 5 + 8 5 ×7 9 = 8 5 ×( 2 1 + 7 9 ) = 8500