小学五年级上册数学练习题(含答案)
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小学五年级上册数学练习题(含答案)
【编著】黄勇权
一、计算题
(1) 18×30= (2)120-78= (3)4.5+2.67= (4)5.2×0.5= (5)105-68= (6)1.65÷0.5= (7)0.42×200= (8)3.1×4.2= (9)8.7×3.4= (10)11.3+5.78= (11)89.2-45.17=
(12)4.12÷0.2= (13)35.6+12.84 (14)61.25-57.32=
(15)13.9 ×4.1= (16)35.5÷0.5= (17)61+3.5=
(18)36×40= (19)250-135= (20)7.7÷0.11=
(21)45+4.7 = (22)160-25.4 = (23)40×2.3=
(24)180÷6= (25)12.5+ 2.3×4= (26)65.4-5.1×3.1= (27)38.2+4.5÷0.9= (28)102-8.1÷3= (29)52.2-12×0.4 = (30)6÷30= (31)1.92÷0.04= (32)0.75+9.25=
(33)35.2÷0.87.9= (34)21.2×4.2+8.1= (35)1.6-0.05= (36)2÷4= (37)75.2÷1.6-12.3= (38)12.63+17.37= (39)14.7×3.6+11.2= (40)1.01×99=
二、用简便方法计算下列各题
(1)2.5×0.1+2.5×0.3 (2)7.5÷0.2+2.5÷0.2
(3)3.6×0.25 (4)7.2×1.34+7.2×3.66
(5)2.5×16×0.4 (6)0.8×3.56+0.4×1.78
(7)3.8×0.25 (8)25×3.2×1.25
(9)77×1.01 (10)10.5×9.8
【答案】
一、计算题
(1)540 (2)42 (3)7.17 (4)26 (5)37 (6)33 (7)84 (8)13.02 (9)29.58 (10)17.08 (11)44.03 (12)20.6 (13)48.44 (14)3.93 (15)56.99 (16)71 (17)64.5 (18)1440 (19)115 (20)70 (21)49.7 (22)134.6 (23)92 (24)30 (25)21.7 (26)49.59 (27)43.2 (28)99.3 (29)47.4 (30)0.2 (31)48 (32)10 (33)36.1 (34)97.14 (35)1.55 (36)0.5 (37)34.7 (38)30 (39)64.12 (40)99.99 二、用简便方法计算下列各题
(1)2.5×0.1+2.5×0.3
=2.5×(0.1+0.3)
=2.5×0.4
=1
(2)7.5÷0.2+2.5÷0.2
=(7.5+2.5)÷0.2
=10÷0.2
=50
(3)3.6×0.25
=0.9×4×0.25
=0.9×(4×0.25)
=0.9×1
=0.9
(4)7.2×1.34+7.2×3.66
=7.2×(1.34+3.66)
=7.2×5
=(7+0.2)×5
=7×5+0.2×5
=35+1
=36
(5)2.5×16×0.4
=2.5×4×4×0.4
=(2.5×4)×(4×0.4)
=10×1.6
=16
(6)0.8×3.56+0.4×1.78
(提示:把3.56分解为2×1.78)
=0.8×2×1.78+0.4×1.78
=1.6×1.78+0.4×1.78
=(1.6+0.4)×1.78
=2×1.78
(7)3.8×0.25
=(4-0.2)×0.25
=4×0.25-0.2×0.25
=1-0.05
=0.95
(8)25×3.2×1.25
=25×4×0.8×1.25
=(25×4)×(0.8×1.25)
=100×1
=100
=3.56
(9)77×1.01
=77×(1+0.01)
=77×1+77×0.01
=77+0.77
=77.77
(10)10.5×9.8
=10.5×(10-0.2)
=10.5×10-10.5×0.2 =105-2.1
=102.9