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简便计算基础
四年级下册 | 加法与乘法运算定律
日期：____/____ 评分：________
一、在括号里填上合适的数或字母
a + b + c = a + ((
c
) + b)
a × b = b × (
a
)
125 × 7 × 8 = 7 × (125 × (
8
))
25 × 13 × 4 = 13 × ((
25
) × 4)
a + b = b + (
a
)
28 + 56 + 72 = 56 + (28 + (
72
))
二、加法简便计算 (注意凑整)
25 + 66 + 275 =
366
249 + 134 + 51 =
434
92 + 92 + 108 =
292
30 + 114 + 70 =
214
53 + 75 + 125 =
253
122 + 291 + 209 =
622
189 + 52 + 111 =
352
144 + 80 + 56 =
280
80 + 50 + 420 =
550
三、乘法简便计算 (找好朋友)
50 × 4 =
200
8 × 250 =
2000
75 × 4 =
300
25 × 18 × 4 =
1875
4 × 11 × 25 =
300
8 × 250 =
2000
125 × 32 =
4000
4 × 75 =
300
125 × 16 =
2000