四年级数学下册乘法运算定律练习题28
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71 × 36 = 36 × ____53 × 26 = ____ × ____30 × 5 × 6 = 30 × ( 5 × ____ )4 × ( 25 × 27 ) = ( ____ × ____ ) × ____649 × 3 + 649 × 7 = 649 × ( ____ + ____ ) ( 96 + 40 ) × m = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
104 ×19 25 ×36 16 ×30145 × 20 × 5 50 × ( 2 + 4 )7000 ÷50 ÷20 4 ×46 ×25032 × 125 999 × 39 + 3928 × 98 + 2 × 28 8000 ÷ 5 ÷ 201002 × 35 - 2 × 35 12 + 99 × 1269 × 25 = 25 × ____77 × 33 = ____ × ____30 × 4 × 5 = 30 × ( 4 × ____ )2 × ( 50 × 20 ) = ( ____ × ____ ) × ____216 × 7 + 216 × 3 = 216 × ( ____ + ____ ) ( 38 + 70 ) × a = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
304 ×16 25 ×32 18 ×20230 × 20 × 5 50 × ( 2 + 4 )8000 ÷200 ÷5 2 ×75 ×50040 × 25 99 × 56 + 5662 × 83 + 17 × 62 6100 ÷ 20 ÷ 5126 × 95 - 26 × 95 79 + 999 × 7984 × 14 = 14 × ____97 × 43 = ____ × ____50 × 2 × 4 = 50 × ( 2 × ____ )5 × ( 20 × 11 ) = ( ____ × ____ ) × ____300 × 2 + 300 × 8 = 300 × ( ____ + ____ ) ( 36 + 36 ) × c = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
305 ×14 25 ×52 18 ×20463 × 4 × 25 50 × ( 2 + 4 )9000 ÷2 ÷500 50 ×89 ×2048 × 25 999 × 37 + 3731 × 74 + 26 × 31 6400 ÷ 10 ÷ 101056 × 69 - 56 × 69 71 + 999 × 7166 × 49 = 49 × ____70 × 41 = ____ × ____40 × 9 × 7 = 40 × ( 9 × ____ )2 × ( 50 × 15 ) = ( ____ × ____ ) × ____374 × 4 + 374 × 6 = 374 × ( ____ + ____ ) ( 16 + 92 ) × c = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
205 ×11 25 ×32 14 ×50621 × 4 × 25 20 × ( 5 + 10 )4000 ÷50 ÷20 25 ×76 ×4024 × 125 9 × 55 + 5545 × 57 + 43 × 45 2800 ÷ 50 ÷ 21096 × 98 - 96 × 98 29 + 99 × 2970 × 35 = 35 × ____81 × 19 = ____ × ____10 × 7 × 7 = 10 × ( 7 × ____ )50 × ( 2 × 10 ) = ( ____ × ____ ) × ____472 × 8 + 472 × 2 = 472 × ( ____ + ____ ) ( 35 + 58 ) × x = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
403 ×15 25 ×28 12 ×40190 × 10 × 10 50 × ( 2 + 4 )2000 ÷4 ÷250 100 ×14 ×1072 × 25 99 × 51 + 5116 × 61 + 39 × 16 200 ÷ 50 ÷ 2114 × 27 - 14 × 27 45 + 9 × 4589 × 45 = 45 × ____61 × 28 = ____ × ____30 × 2 × 6 = 30 × ( 2 × ____ )5 × ( 20 × 22 ) = ( ____ × ____ ) × ____380 × 7 + 380 × 3 = 380 × ( ____ + ____ ) ( 17 + 23 ) × a = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
101 ×16 25 ×32 19 ×40363 × 50 × 2 50 × ( 2 + 4 )8000 ÷2 ÷500 50 ×13 ×2040 × 125 999 × 73 + 7335 × 80 + 20 × 35 5700 ÷ 25 ÷ 4139 × 67 - 39 × 67 17 + 999 × 1785 × 44 = 44 × ____56 × 41 = ____ × ____90 × 4 × 2 = 90 × ( 4 × ____ )4 × ( 25 × 27 ) = ( ____ × ____ ) × ____455 × 2 + 455 × 8 = 455 × ( ____ + ____ ) ( 15 + 42 ) × m = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
206 ×12 25 ×56 13 ×30260 × 10 × 10 50 × ( 2 + 4 )8000 ÷100 ÷10 10 ×94 ×10040 × 25 199 × 58 + 5891 × 8 + 92 × 91 5500 ÷ 50 ÷ 21017 × 29 - 17 × 29 55 + 199 × 5594 × 19 = 19 × ____78 × 44 = ____ × ____20 × 7 × 7 = 20 × ( 7 × ____ )2 × ( 50 × 30 ) = ( ____ × ____ ) × ____474 × 4 + 474 × 6 = 474 × ( ____ + ____ ) ( 12 + 58 ) × c = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。
505 ×17 25 ×40 13 ×20424 × 4 × 25 50 × ( 2 + 4 )1000 ÷500 ÷2 2 ×86 ×50024 × 125 199 × 39 + 3991 × 74 + 26 × 91 2000 ÷ 20 ÷ 51075 × 32 - 75 × 32 96 + 99 × 9668 × 26 = 26 × ____56 × 37 = ____ × ____80 × 6 × 7 = 80 × ( 6 × ____ )4 × ( 25 × 15 ) = ( ____ × ____ ) × ____807 × 4 + 807 × 6 = 807 × ( ____ + ____ ) ( 52 + 64 ) × m = ____ × ____ + ____ × ____ 二、下面各题怎样简便怎样计算。