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1 直接写出得数。
(1) $178 + 178 =$
(2) $96 - 96 ÷ 8 =$
(3) $27 × 4 ÷ 27 × 4 =$
(4) $370 × 3 =$
(5) $32 × 8 =$
(6) $180 - 180 ÷ 3 =$
(7) $2700 ÷ 3 =$
(8) $35 - 35 × 0 =$
(9) $830 - 280 - 320 =$
(1) $178 + 178 =$
(2) $96 - 96 ÷ 8 =$
(3) $27 × 4 ÷ 27 × 4 =$
(4) $370 × 3 =$
(5) $32 × 8 =$
(6) $180 - 180 ÷ 3 =$
(7) $2700 ÷ 3 =$
(8) $35 - 35 × 0 =$
(9) $830 - 280 - 320 =$
答案
(1) 356 (2) 84 (3) 16 (4) 1110 (5) 256 (6) 120 (7) 900 (8) 35 (9) 230
2 递等式计算。（能简便计算的要用简便方法计算）
(1) $611 + 476 + 89 + 824$
(2) $(3864 - 87 × 32) ÷ 45$
(3) $4 × 50 × 2 × 25$
(4) $125 × (111 × 8)$
(5) $99 × 105$
(6) $32 × 164 + 32 - 32 × 65$
(1) $611 + 476 + 89 + 824$
(2) $(3864 - 87 × 32) ÷ 45$
(3) $4 × 50 × 2 × 25$
(4) $125 × (111 × 8)$
(5) $99 × 105$
(6) $32 × 164 + 32 - 32 × 65$
答案
(1) 2000 (2) 24 (3) 10000 (4) 111000 (5) 10395 (6) 3200
(1) 960除以一个数，商是30，这个数是(
32
)。答案
(1) 32
(2)一个数除以89，商是47，这个数是(
4183
)。答案
(2) 4183
(3) 欢欢在计算一道除法算式时，漏写了除数60末尾的零，结果得到的商是40，正确的商应该是(
4
)。答案
(3) 4
(4) $175 × 83 × 4 = 83 × (175 × 4)$，这是运用了(
乘法交换律和乘法结合律
)。答案
(4) 乘法交换律和乘法结合律
