内容正文:
2025-2026学年四年级数学下册人教版
第三单元计算专项06:乘法交换律
日期: 用时: 评价:
一、口算
(1)5×12 = (2)25×4 =
(3)125×8 = (4)50×2 =
(5)25×8 = (6)125×4 =
(7)16×5 = (8)25×2 =
(9)125×2 = (10)50×4 =
二、根据乘法交换律填空
(1)32 × 25 = 25 × ______
(2)18 × 40 = 40 × ______
(3)23 × 5 = 5 × ______
(4)125 × 13 = 13 × ______
(5)45 × 5 = 5 × ______
(6)125 × 8 = 8 × ______
(7)35 × a = a × ______
(8)▲ × ★ = ★ × ______
(9)25×29×4 = ___ × ___ × 29
(10)125×13×8 = 125×___×13
三、利用乘法交换律计算
(1)25×12×4 (2)4×73×25
(3)5×23×2 (4)16×15×5
(5)125×42×8 (6)20×251×5
(7)75×36×4 (8)8×12×25
四、思维拓展(拆数)
(1)25×36 (2)125×48
(3)32×125 (4)125×88
(5)125×72 (6)25×56
(7)50×48 (8)25×64
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参考答案
一、口算
(1)5×12 = 60
(2)25×4 = 100
(3)125×8 = 1000
(4)50×2 = 100
(5)25×8 = 200
(6)125×4 = 500
(7)16×5 = 80
(8)25×2 = 50
(9)125×2 = 250
(10)50×4 = 200
二、根据乘法交换律填空
(1)32 × 25 = 25 × 32
(2)18 × 40 = 40 × 18
(3)23 × 5 = 5 × 23
(4)125 × 13 = 13 × 125
(5)45 × 5 = 5 × 45
(6)125 × 8 = 8 × 125
(7)35 × a = a × 35
(8)▲ × ★ = ★ × ▲
(9)25×29×4 = 25 × 4 × 29
(10)125×13×8 = 125×8×13
三、利用乘法交换律计算
(1)25×12×4
= 25×4×12
= 100×12
= 1200
(2)4×73×25
= 4×25×73
= 100×73
= 7300
(3)5×23×2
= 5×2×23
= 10×23
= 230
(4)16×15×5
= 16×5×15
= 80×15
= 1200
(5)125×42×8
= 125×8×42
=1000× 42
= 42000
(6)20×251×5
= 20×5×251
= 100×251
= 25100
(7)75×36×4
= 75×4×36
= 300×36
= 10800
(8)8×12×25
= 8×25×12
= 200×12
= 2400
四、思维拓展(拆数)
(1)25×36
= 25×4×9
= 100×9
= 900
(2)125×48
= 125×8×6
= 1000×6
= 6000
(3)32×125
= 8×4×125
= 8×125×4
= 1000×4
= 4000
(4)125×88
= 125×8×11
= 1000×11
= 11000
(5)125×72
= 125×8×9
= 1000×9
= 9000
(6)25×56
= 25×4×14
= 100×14
= 1400
(7)50×48
= 50×4×12
= 200×12
= 2400
(8)25×64
= 25×4×16
= 100×16
= 1600
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