内容正文:
2025-2026学年四年级数学下册人教版
第六单元计算专项05:小数加减混合运算
日期: 用时: 评价:
一、不含括号的小数加减混合运算(基础巩固)
(1)1.2 + 3.5 - 2.1 (2)5.6 - 2.3 + 4.7
(3)0.8 + 2.4 + 3.6 (4)7.5 - 3.2 - 1.8
(5)2.15 + 3.85 - 4.5 (6)6.4 - 1.7 + 2.3
(7)0.5 + 1.5 + 2.5 (8)9.3 - 4.6 - 2.7
(9)3.6 + 2.8 - 1.9 (10)8.2 - 5.5 + 3.1
(11)1.05 + 2.95 + 0.5 (12)7.8 - 3.4 - 2.6
二、含进位退位的小数加减混合运算(能力提升)
(1)3.25 + 1.75 - 2.4 (2)8.6 - 3.12 + 2.58
(3)4.08 + 2.92 + 1.5 (4)10.5 - 6.75 - 2.25
(5)2.3 + 5.78 - 3.08 (6)9.45 - 4.6 + 3.55
(7)0.75 + 1.25 + 3.6 (8)12.8 - 5.32 - 4.68
(9)5.6 + 3.45 - 2.05 (10)7.3 - 2.8 + 1.9
(11)3.18 + 4.82 - 5.2 (12)11.2 - 6.55 + 4.85
三、含括号的小数加减混合运算(顺序强化)
(1)(2.5 + 3.8) - 1.6 (2)7.2 - (1.3 + 2.7)
(3)(0.9 + 1.1) + 4.5 (4)10 - (3.6 + 2.4)
(5)(5.25 + 2.75) - 3.5 (6)8.5 - (2.1 - 0.5)
(7)(3.4 + 4.6) + 2.8 (8)15 - (6.2 + 3.8)
(9)(1.8 + 2.2) - 0.5 (10)6.7 - (3.2 - 1.3)
(11)(4.55 + 5.45) + 1.2 (12)9.3 - (2.8 + 3.5)
四、综合混合运算(综合应用)
(1)4.5 + (6.2 - 3.7) + 2.1 (2)9.8 - (2.5 + 3.3) - 1.2
(3)(1.25 + 2.75) + (3.5 - 1.5) (4)7.6 - (1.8 + 2.2) + 3.4
(5)3.2 + (5.8 - 2.3) - 1.7 (6)12.5 - (4.6 - 1.5) + 3.1
(7)(0.8 + 1.2) + (4.3 - 2.3) (8)8.4 - (3.1 + 2.9) - 0.4
(9)5.1 + (6.9 - 3.4) + 2.5 (10)10.2 - (2.8 + 3.2) + 1.8
(11)(2.35 + 3.65) + (5.2 - 3.2) (12)13.7 - (5.4 - 2.3) - 4.6
第 1 页 共 1 页
学科网(北京)股份有限公司
参考答案
一、不含括号的小数加减混合运算(基础巩固)
(1)1.2 + 3.5 - 2.1
= 4.7 - 2.1
= 2.6
(2)5.6 - 2.3 + 4.7
= 3.3 + 4.7
= 8
(3)0.8 + 2.4 + 3.6
= 3.2 + 3.6
= 6.8
(4)7.5 - 3.2 - 1.8
= 4.3 - 1.8
= 2.5
(5)2.15 + 3.85 - 4.5
= 6 - 4.5
= 1.5
(6)6.4 - 1.7 + 2.3
= 4.7 + 2.3
= 7
(7)0.5 + 1.5 + 2.5
= 2+ 2.5
= 4.5
(8)9.3 - 4.6 - 2.7
= 4.7 - 2.7
= 2
(9)3.6 + 2.8 - 1.9
= 6.4 - 1.9
= 4.5
(10)8.2 - 5.5 + 3.1
= 2.7 + 3.1
= 5.8
(11)1.05 + 2.95 + 0.5
= 4 + 0.5
= 4.5
(12)7.8 - 3.4 - 2.6
= 4.4 - 2.6
= 1.8
二、含进位退位的小数加减混合运算(能力提升)
(1)3.25 + 1.75 - 2.4
= 5 - 2.4
= 2.6
(2)8.6 - 3.12 + 2.58
= 5.48 + 2.58
= 8.06
(3)4.08 + 2.92 + 1.5
= 7 + 1.5
= 8.5
(4)10.5 - 6.75 - 2.25
= 3.75 - 2.25
= 1.5
(5)2.3 + 5.78 - 3.08
= 8.08 - 3.08
= 5
(6)9.45 - 4.6 + 3.55
= 4.85 + 3.55
= 8.4
(7)0.75 + 1.25 + 3.6
= 2 + 3.6
= 5.6
(8)12.8 - 5.32 - 4.68
= 7.48 - 4.68
= 2.8
(9)5.6 + 3.45 - 2.05
= 9.05 - 2.05
= 7
(10)7.3 - 2.8 + 1.9
= 4.5 + 1.9
= 6.4
(11)3.18 + 4.82 - 5.2
= 8 - 5.2
= 2.8
(12)11.2 - 6.55 + 4.85
= 4.65 + 4.85
= 9.5
三、含括号的小数加减混合运算(顺序强化)
(1)(2.5 + 3.8) - 1.6
= 6.3 - 1.6
= 4.7
(2)7.2 - (1.3 + 2.7)
= 7.2 - 4
= 3.2
(3)(0.9 + 1.1) + 4.5
= 2 + 4.5
= 6.5
(4)10 - (3.6 + 2.4)
= 10 - 6
= 4
(5)(5.25 + 2.75) - 3.5
= 8 - 3.5
= 4.5
(6)8.5 - (2.1 - 0.5)
= 8.5 - 1.6
= 6.9
(7)(3.4 + 4.6) + 2.8
= 8 + 2.8
= 10.8
(8)15 - (6.2 + 3.8)
= 15 - 10
= 5
(9)(1.8 + 2.2) - 0.5
= 4 - 0.5
= 3.5
(10)6.7 - (3.2 - 1.3)
= 6.7 - 1.9
= 4.8
(11)(4.55 + 5.45) + 1.2
= 10 + 1.2
= 11.2
(12)9.3 - (2.8 + 3.5)
= 9.3 - 6.3
= 3
四、综合混合运算(综合应用)
(1)4.5 + (6.2 - 3.7) + 2.1
= 4.5 + 2.5 + 2.1
= 7 + 2.1
= 9.1
(2)9.8 - (2.5 + 3.3) - 1.2
= 9.8 - 5.8 - 1.2
= 4 - 1.2
= 2.8
(3)(1.25 + 2.75) + (3.5 - 1.5)
= 4 + 2
= 6
(4)7.6 - (1.8 + 2.2) + 3.4
= 7.6 - 4 + 3.4
= 3.6 + 3.4
= 7
(5)3.2 + (5.8 - 2.3) - 1.7
= 3.2 + 3.5 - 1.7
= 6.7 - 1.7
= 5
(6)12.5 - (4.6 - 1.5) + 3.1
= 12.5 - 3.1 + 3.1
= 9.4 + 3.1
= 12.5
(7)(0.8 + 1.2) + (4.3 - 2.3)
= 2 + 2
= 4
(8)8.4 - (3.1 + 2.9) - 0.4
= 8.4 - 6 - 0.4
= 2.4 - 0.4
= 2
(9)5.1 + (6.9 - 3.4) + 2.5
= 5.1 + 3.5 + 2.5
= 8.6 + 2.5
= 11.1
(10)10.2 - (2.8 + 3.2) + 1.8
= 10.2 - 6 + 1.8
= 4.2 + 1.8
= 6
(11)(2.35 + 3.65) + (5.2 - 3.2)
= 6 + 2
= 8
(12)13.7 - (5.4 - 2.3) - 4.6
= 13.7 - 3.1 - 4.6
= 10.6 - 4.6
= 6
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