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小数乘法计算600道
第一部分
一.计算题(共50小题) 1.直接写出得数. 0.4×0.02= 3﹣0.98=
1.8×0.4= 0.9÷0.01=
6×0.25= 3.9×0.01=
1.25×0.8= 99×0.25=
2.用竖式计算下面各题.
2.4×1.5= 0.46×8.7=(保留一位小数) 2.24×1.8=(保留两位小数)
3.用竖式计算.(得数保留两位小数) 3.35×1.7≈ 5.63×3.9≈
4.用竖式计算.
2.97×3.5= 6.05×0.83= 0.78×4.5= 3.36×3.67=
5.直接写得数. 6.2×0.3= 0.16×25=
2.5×0.8= 5×2.1=
0.06×5= 0×48.76=
6.用竖式计算(计算结果小数部分超过两位的,保留两位小数). 6.02×0.35 0.59÷1.4.
7.按要求算一算.
2.9×1.8 4.58×0.37 0.8×2.5(得数保留一位小数)
5.45×1.72(得数保留两位小数)
8.列竖式计算:
1.8×0.85= 7.6﹣2.19= 50﹣18.75=
9.用竖式计算.
4.68×1.2= 1.58×2.5=
10.竖式计算.
1.35×270 6.4×8.05. 11.用竖式计算.
36×5.5
18×3.06
3.45×21
0.28×0.25 150×0.12 0.87×1.5
0.4×0.076 1.5×0.062 6.5×0.04
12.竖式计算.
0.94×5.3= 0.91×2.6= 4.06×0.75(保留两位小数)≈ 8.43×1.5= 0.25×3.2= 7.8×0.9(保留一位小数)≈ 13.直接写出得数. 0.25×4= 6.29×100= 14.我会口算. 0.5×4.4= 5×0.4×0.8= 4﹣0.15= 15.口算. 3π= 92=
5π= 62﹣32=
5×3.14= 4π﹣1.5π=
0.5×7= 34.6÷0.5=
80÷1.6= 9.9+10.1= 1.7×5+0.3×5=
5.5÷0.11= 1.25×0.8=
0.06×5= 0.08÷0.1=
1.25×8= 0.02×500=
8.2×6.9×0= 3.4×2=
0.2×18= 0.26×0.5=
16.用竖式计算,得数保留一位小数. 2.4×6.7≈ 3.5×0.5≈
17.直接写出得数. 0.8×25= 2.4×0.2= 8.29×100= 18.列竖式计算.
0.64×12.5= 2.8×0.17=
19.直接写出得数.
0.7×0.9= 0.14×0.3= 5.5×10= 2.6×0.5=
20.用竖式计算
2.75×3.1= 3.18×5.45=
0.76×2.18≈(得数保留两位小数) 0.09×1.7≈(精确到十分位)
21.列竖式计算
0.36×0.15=(得数保留两位小数) 1.45×0.12=
0.86×1.4=(得数保留一位小数) 6.5×0.39=
0×4.23= 0.02×500= 2.5×0.4=
0.57+0.43= 2.8×10= 4.87﹣1.7=
22.用竖式计算. 8×0.12=
1.9×3.5=
2.3×1.29=(验算)
0.401×0.3= 0.45×0.96= 0.17×0.71=(得数保留两位小数)
23.直接写得数. 70×0.01= 2.515×10= 1.1×0.4= 6.5×0.2=
0.1×0.01=
0.87﹣0.6=
24.竖式计算.(得数保留一位小数)
0.38×0.23 5.79×3.6 4.6×0.25.
25.竖式计算.
3.6×0.25= 9.8﹣1.64= 3.1×300=
26.口算. 0.7×0.5= 3.6×2= 0.4×1.7= 0.36+9=
5.7+3=
6.6×2=
27.直接写出计算结果 0.3×1.1= 5.79+2.31+4.21= 0.25×4= 1.5×0.6=
1.59÷0.3=
0.5×101=
10﹢0.3= 1.7×3=
4.5×6= 0.1×3.1=
1.2÷0.4= 6.5﹣5=
10﹣8.88﹣0.12= 28.直接写得数. 0.6×0.7= 2.3×4×0= 29.用竖式计算.
0.64÷1.6×1.5=
0.8×5= 0.05×1.6=
1.1×0.4= 0.02×7=
0.32×0.8= 1.36×4.8= 17.3×0.06=
30.用竖式计算.
1.45×0.12= 3.08×0.28= 13.5×26.7= 3.15×0.35≈(保留一位小数)
31.口算.
9.37×0= 7.3×100= 289+72﹣89= 1﹣0.04= 4×8÷8×4= 32.列竖式计算:
30.5×0.76 0.54×0.19. 33.直接写得数: 2.5×3 4.2×10 2.2×4 34.竖式计算
0.38×0.25= 0.12×15=
8.5×0.39=(验算) 0.87×1.5(保留二位小数)
3.06×2 5.3×100
1.6×4
0.25×4 2.5×6 1.25×8
35.用竖式计算并验算.
14.53+5.67 7.2﹣6.45 1.05×2.8 62.9÷1.7.
36.口算: 0.5×2= 7÷0.7= 37.口算 0.2×0.4= 0.8×50=
8.2+1.8= 2.4×5=
6.45×0.01= 0.9﹣0.52=
2.5×0.4= 10.2×4.5=
0.25×4= 1﹣0.125×8=
12.5×8= 1.25×32=
0.125×8= 0.25×56=
38.竖式计算,带*的要验算 *4.23×0.028
36×0.56
31.5×24.5
0.8×0.56 *0.63×1.05 1.8×3.67
39.竖式计算
35.4×0.8 7.63×1.2 0.08×1.14 3.17×2.8(得数保留两位小数)
0.3×5.6(得数保留一位小数) 54.3×0.7(得数保留整数)
40.列竖式计算
24.6÷12 4.32÷1.2 21÷0.15.
41.直接写出得数
0×7= 15×0.01= 1.8a+0.2a= 0.12×0.04= 2.5×4×0= 42.口算. 0.12×100= 12万+3万= 3.74×100= 43.竖式计算
0.18×12 14×0.5 0.02×13
2.6+0.4= 21.2﹣21= 0.4×0.4= 0.8×100= 0.72×0.8=
6.2×10= 500÷1000= 8a+a= 6.2÷10= 23.6÷100=
3.25×10=
3.26 ×15 3.1 ×17 1.25×4
8.4 ×15 0.45 ×9 1.5×35
4.28 ×16 2.61 ×18
44.直接写出得数. 40×1.2= 2.4×0.5=
25×0.4= 1.25×80=
63= 3.6÷0.06=
7.8+0.9= 12÷0.4=
0.56+4.44= 82=
45.列竖式计算
2.034×18 4.06×3.8 (积保留两位小数) 46.计算
4×38.2= 8×0.352= 35.6×5= 6.7×3= 47.口算 9.5×0.2= 4.8×50=
3.2×0.5= 4.8×0.25=
0.8×2.5= 8.8×5=
4.4×0.4= 1.4×0.5=
35×0.4= 12.5×4=
48.竖式计算.
☆0.43×27= 1.85×2.6=验算:
0.37×2.4≈(得数保留一位小数) 7.02×0.56≈(得数保留两位小数)
49.直接写出得数. 0.7×0.9= 1.7×0.03= 50.竖式计算.
2.6×0.5= 1.8×0.04=
0.14×0.3= 0.12×6=
5.5×10= 4.8×5=
5.6×1.8= 0.25×0.046≈(保留两位小数) 3500×0.96=
第二部分
一.计算题(共50小题) 1.列竖式计算: 1.8×0.36=
35.37+28.63=
19.9﹣8.75=
1.06×0.48= 18.9+28.65= 22.87﹣18.65=
2.用竖式计算下面各题.
2.4×1.5= 0.46×8.7=(保留一位小数) 2.24×1.8=(保留两位小数)
3.直接写得数. 0.102×100= 3.6÷0.6=
4.2+3= 42=
0.23×0.5= 0.1÷0.01=
0.25×7×0.4= 2×0.5+1=
4.用竖式计算(计算结果小数部分超过两位的,保留两位小数). 6.02×0.35 8.74÷3.8 0.59÷1.4.
5.列竖式计算: 1.8×0.85=
6.用竖式计算.
4.8×0.25 9.3×1.3 9.8×0.5 2.1×2.15.
7.用竖式计算.(得数保留两位小数) 3.35×1.7≈ 5.63×3.9≈
8.直接写出得数. 0.12×0.4= 19.28﹣0.8= 9.列竖式计算
3.48×1.05(计算并验算) 1.55÷3.8(得数保留两位小数)
10.竖式计算 0.64×18=
25.8×102=
40.7×0.25=
3.8÷100= 2.8÷0.7=
56.56÷0.56 1.6+3.04= 0.53×1000=
108÷2.5÷4=
7.6﹣2.19= 50﹣18.75=
13.45×2.6=(保留整数) 4.865 ×8≈(保留整数) 10.23 ×42≈(保留一位小数)
11.直接写得数. 6.2×0.3= 0.16×25=
12.按要求算一算.
2.9×1.8 4.58×0.37
0.8×2.5(得数保留一位小数) 5.45×1.72(得数保留两位小数)
13.用竖式计算. 84×0.25=
0.55×64=
0.47×5.8=
2.5×0.8= 5×2.1=
0.06×5= 0×48.76=
6.06×0.32= 0.075×0.07= 3.7×9.77=
14.列竖式计算.
3.4×0.25 6.5×2.4 0.035×0.6 1.25×0.024.
15.用竖式计算.
2.97×3.5= 6.05×0.83= 0.78×4.5= 3.36×3.67=
16.用竖式计算.
36×5.5
0.28×0.25 0.4×0.076 17.竖式计算
4.57×1.8
9.37×8.5
0.125×0.8 2.07×3.6 18×3.06
150×0.12 1.5×0.062 3.75×0.24 3.35×1.6.
3.45×21
0.87×1.5
6.5×0.04
18.竖式计算.
0.94×5.3= 0.91×2.6= 4.06×0.75(保留两位小数)≈
8.43×1.5= 0.25×3.2= 7.8×0.9(保留一位小数)≈
19.我会口算. 0.5×4.4= 5×0.4×0.8= 4﹣0.15=
80÷1.6= 9.9+10.1= 1.7×5+0.3×5=
5.5÷0.11= 1.25×0.8=
0.06×5= 0.08÷0.1=
20.列竖式计算,带*号的要验算.
25.78+3.12= 13.8×9= *8﹣2.67= *5.73+6.7=
21.直接写出得数. 0.125×100= 15.7+4.3= 14.6+0.34= 22.用竖式计算.
4.68×1.2= 1.58×2.5=
60÷100= 25×4= 30.5+2.5=
9÷10= 10﹣0.8= 24﹣7.54﹣2.46=
0.32+4.68= 7×99+7= 26+19+74+81=
23.用竖式计算,得数保留一位小数. 2.4×6.7≈ 3.5×0.5≈
24.竖式计算
7.6×0.82= 3.25×0.31= 7.5×0.59=(验算)
25.口算. 3π= 92=
26.直接写出得数. 0.8×25= 2.4×0.2= 8.29×100= 27.列竖式计算.
0.64×12.5= 2.8×0.17=
28.列竖式计算
4.8×17 1.88×25 2.4×0.37 0.89×5.3.
5π= 62﹣32=
5×3.14= 4π﹣1.5π=
0.5×7= 34.6÷0.5=
0×4.23= 0.02×500= 2.5×0.4=
0.57+0.43= 2.8×10= 4.87﹣1.7=
29.列竖式计算.(得数保留两位小数)
2.375×105 5.16×4.3 0.45×0.206.
30.列竖式计算.
0.04×0.12 4.25×8.8 3.84×0.25.
31.竖式计算.
3.6×0.25= 9.8﹣1.64= 3.1×300=
32.用竖式计算
2.75×3.1= 3.18×5.45=
0.76×2.18≈(得数保留两位小数) 0.09×1.7≈(精确到十分位)
33.列竖式计算
0.36×0.15=(得数保留两位小数) 1.45×0.12=
0.86×1.4=(得数保留一位小数) 6.5×0.39=
34.用竖式计算. 8×0.12=
1.9×3.5=
2.3×1.29=(验算)
0.401×0.3= 0.45×0.96= 0.17×0.71=(得数保留两位小数)35.直接写出得数.
0.7×0.9= 0.14×0.3= 5.5×10= 2.6×0.5= 36.列竖式计算:
30.5×0.76 0.54×0.19.
37.竖式计算.
1.35×270 6.4×8.05.
38.直接写得数. 70×0.01=
2.515×10=
1.1×0.4=
10﹢0.3=
6.5×0.2= 39.列竖式计算
0.1×0.01= 0.87﹣0.6= 1.7×3=
24.6÷12 4.32÷1.2 21÷0.15.
40.
直接写出得数. 0×7= 15×0.01= 1.8a+0.2a= 0.12×0.04= 2.5×4×0=
41.竖式计算.(得数保留一位小数) 0.38×0.23 5.79×3.6 4.6×0.25.
42.用竖式计算.
0.32×0.8= 1.36×4.8= 17.3×0.06=
43.竖式计算(*验算)
8.4×0.15= 16.51﹣6.3= 900﹣4.58= *56.7+0.33=
2.6+0.4= 21.2﹣21= 0.4×0.4= 0.8×100= 0.72×0.8=
44.口算. 0.7×0.5= 0.36+9=
45.用竖式计算.
1.45×0.12= 3.08×0.28= 13.5×26.7=
3.15×0.35≈(得数保留一位小数)
46.竖式计算
0.38×0.25= 0.12×15=
8.5×0.39=(验算) 0.87×1.5 (得数保留二位小数)
47.直接写出计算结果 0.3×1.1= 1.5×0.6= 10﹣8.88﹣0.12=
5.79+2.31+4.21= 1.59÷0.3= 0.64÷1.6×1.5=
3.6×2= 5.7+3=
0.4×1.7= 6.6×2=
4.5×6= 0.1×3.1=
0.25×4= 0.5×101=
1.2÷0.4= 6.5﹣5=
48.竖式计算
0.38×0.25
150×0.12 0.87 ×1.9
1.28×2.3 2.07×0.24 0.17 ×1.05
49.用竖式计算.
8×0.12=(验算) 1.9×3.5=(验算)
0.401×0.3= 0.45×0.96= 0.17×0.71= 50.
直接写出得数.
0.13×0.2= 1﹣0.9= 0.32÷2= 0.9×0.1= 3.11+2.22= 0.52= 1.62﹣0.62= 5.9+4.4=
0.053×100=
0.8×5= 8m﹣6m= 12.5+12.5×7=
))))))))
第一部分参考答案与试题解析一.计算题(共50小题)1.【解答】解: 0.4×0.02=0.008 1.8×0.4=0.72 6×0.25=1.5 3﹣0.98=2.02
1.25×0.8=1
0.9÷0.01=90 3.9×0.01=0.039 99×0.25=24.75
2.【解答】解:(1)2.4×1.5=3.6(2)0.46×8.7≈4.0(3)
2.24×1.8≈4.03 3.【解答】解:3.35×1.7≈5.705.63×3.9
≈21.96 4.【解答】解:2.97×3.5=10.3956.05×
0.83=5.02155.【解答】解:
0.78×4.5=3.513.36×3.67=12.3312
6.2×0.3=1.86 2.5×0.8=2 0.06×5=0.3 0.16×25=4
5×2.1=10.5 0×48.76=0
6.【解答】解:6.02×0.35≈2.118.74÷3.8=2.30.59÷1.4≈
0.42 7.【解答】解:2.9×1.8=5.224.58×
)))))))))
))))))))
0.37=1.69460.8×2.5=2.05.45×1.72≈9.37 8.【解答】
解:1.8×0.85=1.537.6﹣2.19=5.4150﹣18.75=31.25
9.【解答】解:4.68×1.2=5.6161.58×2.5=3.95 10.【解答】
解:1.35×270=368.5 6.4×8.05=51.52
11.【解答】解:(1)36×5.5=198;(2)18×3.06=55.08;
(3)3.45×21=72.45;(4)0.28×0.25=0.07;
(5)150×0.12=18; (6)0.87×1.5=1.305;
(7)0.4×0.076=0.0304; (8)1.5×0.062=0.093;
(9)6.5×0.04=0.26. 12.【解答】解:(1)0.94×5.3=4.982;
)))))))))
))))))))
(2)0.91×2.6=2.366;(3)4.06×0.75≈3.05;(4)8.43×1.5=12.645;
(5)0.25×3.2=0.8;0.25×4=1
1.25×8=10
(6)7.8×0.9≈7.0.8.2×6.9×0=0 0.2×18=3.6
0.26×0.5=0.13
13.【解答】解:
6.29×100=629 0.02×500=10 3.4×2=6.8 14.【解答】解: 0.5×4.4=2.2
80÷1.6=50
5.5÷0.11=50 0.06×5=0.3 1.25×0.8=1 0.08÷0.1=0.8
5×0.4×0.8=1.6 9.9+10.1=20 4﹣0.15=3.85
1.7×5+0.3×5=10
15.【解答】解:
3π=9.42 5π=15.7 5×3.14=15.7 0.5×7=3.5 92=81
62﹣32=27 4π﹣1.5π=7.85 34.6÷0.5=69.2
16.【解答】解:2.4×6.7≈16.1解: 0.8×25=2
0×4.23=0
0.57+0.43=1
3.5×0.5≈1.8 17.【解答】
2.4×0.2=0.48 0.02×500=10 2.8×10=28 8.29×100=829 2.5×0.4=1
4.87﹣1.7=3.17
18.【解答】解:(1)0.64×12.5=8(2)2.8×0.17=0.476
19.【解答】解:0.7×0.9=0.630.14×0.3=0.0425.5×10=552.6×0.5=1.3. 20.【解
)))))))))
))))))))
答】解:(1)2.75×3.1=8.525(2)3.18×5.45=17.331(3)
0.76×2.18≈1.66(得数保留两位小数)(4)0.09×1.7≈0.2(精确到
十分位) 21.【解答】解:0.36×0.15≈0.051.45×
0.12=0.1740.86×1.4≈0.16.5×0.39=2.535 22.【解答】
解:8×0.12=0.961.9×3.5=6.652.3×
1.29=2.9670.401×0.3=0.12030.45×
0.96=0.4320.17×0.71≈0.12 23.【解答】解:
70×0.01=0.7 2.515×10=25.15 1.1×0.4=0.44 10﹢0.3=10.3 6.5×0.2=1.3 0.1×0.01=0.001 0.87﹣0.6=0.27 1.7×3=5.1
)))))))))
))))))))
24.【解答】解:0.38×0.23≈0.15.79×3.6≈20.84.6×0.25
≈1.2 25.【解答】解:3.6×0.25=0.99.8﹣
1.64=8.163.1×300=930 26.【解答】解:
0.7×0.5=0.35 3.6×2=7.2 0.4×1.7=0.68 4.5×6=27 0.36+9=9.36 5.7+3=8.7 6.6×2=13.2 0.1×3.1=0.31 27.【解答】解: 0.3×1.1=0.33 1.5×0.6=0.9
5.79+2.31+4.21=12.31 0.25×4=1 1.59÷0.3=5.3
1.2÷0.4=3
0.5×101=50.5 6.5﹣5=1.5
10﹣8.88﹣0.12=1 0.64÷1.6×1.5=0.6 28.【解答】解: 0.6×0.7=0.42 0.8×5=4
1.1×0.4=0.44
2.3×4×0=0 0.05×1.6=0.08 0.02×7=0.14
29.【解答】解:0.32×0.8=0.2561.36×4.8=6.52817.3×
0.06=1.038 30.【解答】解:1.45×0.12=0.1743.08×
0.28=0.862413.5×26.7=360.453.15×0.35≈1.1
)))))))))
))))))))
31.【解答】解:9.37×0=07.3×100=730289+72﹣89=2721﹣0.04=0.964×8÷8×
4=16 32.【解答】解:30.5×0.76=23.18 0.54×
0.19=0.1026 33.【解答】解:
2.5×3=7.5 3.06 ×2=6.12 0.25 ×4=1 4.2×10=42 5.3 ×100=530 2.5×6=15 2.2×4=8.8 1.6 ×4=6.4 1.25 ×8=10
34.【解答】解:0.38×0.25=0.0950.12×15=1.88.5×
0.39=3.315 0.87×1.5≈
1.31 35.【解答】解:①14.53+5.67=20.2②7.2
﹣6.45=0.75③1.05×2.8=2.94验算:④
62.9÷1.7=370.5×2=1 0.25×4=1
验算: 36.【解答】解:
12.5×8=100 0.125×8=1
)))))))))
))))))))
7÷0.7=10 1﹣0.125×8=0 1.25×32=80 0.25×56=14 37.【解答】解:
0.2×0.4=0.08 8.2+1.8=10 6.45×0.01=0.0645 2.5×0.4=1 0.8×50=40
38
2.4×5=12 0.9﹣0.52=0.28 .
【
解
答
10.2×4.5=45.9 】
解
:
*4.23
×
0.028=0.1184436×
0.56=20.1631.5×24.5=771.750.8×
0.56=0.448*0.63×
1.05=0.66151.8×3.67=6.606
39.【解答】解:35.4×0.8=28.32 7.63×1.2=9.156
0.08×1.14=0.09123.17×2.8≈8.88; 0.3×5.6≈
1.7 54.3×0.7≈4
)))))))))
40.【解答】解:24.6÷
))))))))
12=2.05 41.【解答】解: 0×7=0 15×0.01=0.15 1.8a+0.2a=2a
4.32÷1.2=3.6 21÷0.15=140
2.6+0.4=3 21.2﹣21=0.2 0.4×0.4=0.16
0.12×0.04=0.0048 0.8×100=80 2.5×4×0=0
0.72×0.8=0.576
42.【解答】解: 0.12×100=12
6.2×10=62
500÷1000=0.5 6.2÷10=0.62
12万+3万=15万 8a+a=9a 3.74×100=374
23.6÷100=0.236 3.25×10=32.5
43.【解答】解:(1)0.18×12=2.16(2)3.26×15=48.9 (3)
3.1×17=52.7(4)1.25×4=5(5)14×0.5=7(6)8.4×15=126
(7)0.45×9=4.05 (8)1.5×35=52.5(9)0.02×13=0.26
(10)4.28×16=68.48
解:
(11)2.61×18=46.98 44.【解答】
)))))))))
))))))))
40×1.2=48 25×0.4=10 63=216 7.8+0.9=8.7 0.56+4.44=5
2.4×0.5=1.2 1.25×80=100 3.6÷0.06=60 12÷0.4=30 82=64
45.【解答】解:①2.034×18=36.612②4.06×3.8≈15.43
46.【解答】解:4×38.2=152.88×0.352=2.81635.6×
5=1786.7×3=20.1 47.【解答】解:
9.5×0.2=1.9 3.2×0.5=1.6 0.8×2.5=2 4.4×0.4=1.76 35×0.4=14 4.8×50=240 4.8×0.25=1.2 8.8×5=44 1.4×0.5=0.7 12.5×4=50
48.【解答】解:0.43×27=11.61;1.85×2.6=4.81;
0.37×2.4≈0.9(得数保留一位小数);7.02
×0.56≈3.93(得数保留两位小数);0.7×0.9=0.63
2.6×0.5=1.3
49.【解答】解:
0.14×0.3=0.042 5.5×10=55
4.8×5=24
1.7×0.03=0.051 1.8×0.04=0.072 0.12×6=0.72
)))))))))
))))))))
50.【解答】解:5.6×1.8=10.08 0.25×0.046≈
0.01
算题(共
3500×0.96=336050
第二部分参考答案与试题解析一.计
小题)1.【解答】解:1.8×
0.36=0.64835.37+28.63=6419.9﹣8.75=11.151.06×
0.48=0.508818.9+28.65=47.5522.87﹣18.65=4.22
2.【解答】解:(1)2.4×1.5=3.6(2)0.46×8.7≈4.0(3)2.24
×1.8≈4.03 3.【解答】解:
0.102×100=102 4.2+3=7.2 0.23×0.5=0.115 0.25×7×0.4=0.7 3.6÷0.6=6
42=16
0.1÷0.01=10
2×0.5+1=2
4.【解答】解:6.02×0.35≈2.118.74÷3.8=2.30.59÷1.4≈
0.42 5.【解答】解:1.8×0.85=1.53
)))))))))
7.6﹣2.19=5.4150
))))))))
﹣18.75=31.25 6.【解答】解:4.8×0.25=1.29.3×
1.3=12.099.8×0.5=4.92.1×2.15=4.515 7.【解答】解:
3.35×1.7≈5.705.63×3.9≈21.96 8.【解答】解:
0.12×0.4=0.048 3.8÷100=0.038 56.56÷0.56=101 1.6 +3.04=4.64 19.28﹣0.8=18.48 2.8÷0.7=4
0.53×1000=530 108÷2.5÷4=10.8
9.【解答】解:3.48×1.05=3.654验算:1.55÷3.8≈
0.41 10.【解答】解:0.64×18=11.5225.8×
102=2631.640.7×0.25=10.17513.45×2.6≈35 4.865
×8≈3910.23×42≈429.7 11.【解答】解:
6.2×0.3=1.86 2.5×0.8=2 0.06×5=0.3 0.16×25=4
5×2.1=10.5 0×48.76=0
12.【解答】解:2.9×1.8=5.22
)))))))))
4.58×0.37=1.69460.8×
))))))))
2.5=2.05.45×1.72≈9.37 13.【解答】解:84×
0.25=210.55×64=35.20.47×5.8=2.7266.06×
0.32=1.93920.075×0.07=0.005253.7×9.77=36.149
14.【解答】解:①3.4×0.25=0.85 ②6.5×2.4=15.6
③0.035×0.6=0.021 ④1.25×0.024=0.03 15.【解
答】解:2.97×3.5=10.3956.05×0.83=5.02150.78×
4.5=3.513.36×3.67=12.3312 16.【解答】解:(1)36×5.5=198;
(2)18×3.06=55.08; (3)3.45×
21=72.45;(4)0.28×0.25=0.07;
)))))))))
(5)
))))))))
150×0.12=18; (6)0.87×1.5=1.305; (7)
0.4×0.076=0.0304; (8)1.5×0.062=0.093;
(9)6.5×0.04=0.26. 17.【解答】解:(1)4.57×1.8=8.226;
(2)0.125×0.8=0.1;(3)3.75×0.24=0.9;(4)9.37×8.5=79.645;
(5)2.07×3.6=7.452;(6)3.35×1.6=5.36. 18.【解答】
解:(1)0.94×5.3=4.982;(2)0.91×2.6=2.366;(3)4.06×0.75
≈3.05;(4)8.43×1.5=12.645;(5)0.25×3.2=0.8;(6)
7.8×0.9≈7.0.0.5×4.4=2.2
19.【解答】解: 80÷1.6=50
5.5÷0.11=50 0.06×5=0.3 1.25×0.8=1 0.08÷0.1=0.8
5×0.4×0.8=1.6 9.9+10.1=20 4﹣0.15=3.85
1.7×5+0.3×5=10
)))))))))
))))))))
20.【解答】解:25.78+3.12=28.913.8×9=124.2*8﹣
2.67=5.33解:
验算:*5.73+6.7=12.43验算: 21.【解答】
0.125×100=12.5 60÷100=0.6 9÷10=0.9 15.7+4.3=20
25×4=100 10﹣0.8=9.2
0.32+4.68=5 7×99+7=700
14.6+0.34=14.94 30.5+2.5=33 24﹣7.54﹣2.46=14 26+19+74+81=200
22.【解答】解:4.68×1.2=5.6161.58×2.5=3.95 23.【解答】
解:2.4×6.7≈16.13.5×0.5≈1.8 24.【解答】解:(1)7.6
×0.82=6.232;(2)3.25×0.31=1.0075;(3)7.5×
0.59=4.425. 25.【解答】解:
3π=9.42 5π=15.7 5×3.14=15.7 0.5×7=3.5 92=81
62﹣32=27 4π﹣1.5π=7.85 34.6÷0.5=69.2
26.【解答】解: 0.8×25=2
0×4.23=0
0.57+0.43=1
2.4×0.2=0.48 0.02×500=10 2.8×10=28 8.29×100=829 2.5×0.4=1
4.87﹣1.7=3.17
)))))))))
))))))))
27.【解答】解:(1)0.64×12.5=8(2)2.8×0.17=0.476
28.【解答】解:4.8×17=81.61.88×25=472.4×
0.37=0.8880.89×5.3=4.717 29.【解答】解:2.375×105≈
249.38 5.16×4.3≈22.19 0.45×
0.206≈0.09 30.【解答】解:0.04×0.12=0.0048 4.25×
8.8=37.43.84×0.25=0.952 31.【解答】解:3.6×
0.25=0.99.8﹣1.64=8.163.1×300=930 32.【解
答】解:(1)2.75×3.1=8.525(2)3.18×5.45=17.331(3)
)))))))))
))))))))
0.76×2.18≈1.66(得数保留两位小数)(4)0.09×1.7≈0.2(精确到
十分位) 33.【解答】解:0.36×0.15≈0.051.45×
0.12=0.1740.86×1.4≈0.16.5×0.39=2.535 34.【解答】
解:8×0.12=0.961.9×3.5=6.652.3×
1.29=2.9670.401×0.3=0.12030.45×
0.96=0.4320.17×0.71≈0.12 35.【解答】解:0.7×
0.9=0.630.14×0.3=0.0425.5×10=552.6×0.5=1.3. 36.【解答】解:30.5×
0.76=23.18 0.54×0.19=0.1026
37.【解答】解:1.35×270=368.5 6.4×
)))))))))
))))))))
8.05=51.52 38.【解答】解:
70×0.01=0.7 2.515×10=25.15 1.1×0.4=0.44 10﹢0.3=10.3 6.5×0.2=1.3 0.1×0.01=0.001 0.87﹣0.6=0.27 1.7×3=5.1
39.【解答】解:24.6÷12=2.05 4.32÷1.2=3.6 21
÷0.15=1400×7=0 15×0.01=0.15 1.8a+0.2a=2a
40.【解答】解: 2.6+0.4=3 21.2﹣21=0.2 0.4×0.4=0.16
0.12×0.04=0.0048 0.8×100=80 2.5×4×0=0
0.72×0.8=0.576
41.【解答】解:0.38×0.23≈0.15.79×3.6≈20.84.6×0.25
≈1.2 42.【解答】解:0.32×0.8=0.2561.36×
4.8=6.52817.3×0.06=1.038 43.【解答】解:8.4×
)))))))))
))))))))
0.15=1.2616.51﹣6.3=10.21900﹣
4.58=895.42*56.7+0.33=57.03 44.【解答】解:
0.7×0.5=0.35 3.6×2=7.2 0.4×1.7=0.68 4.5×6=27 0.36+9=9.36 5.7+3=8.7 6.6×2=13.2 0.1×3.1=0.31
45.【解答】解:1.45×0.12=0.1743.08×0.28=0.862413.5
×26.7=360.453.15×0.35≈1.1 46.【解答】解:0.38×
0.25=0.0950.12×15=1.88.5×
0.39=3.315 0.87×1.5≈
1.31
0.3×1.1=0.33
47.【解答】解:
5.79+2.31+4.21=12.31 0.25×4=1
1.2÷0.4=3
)))))))))
))))))))
1.5×0.6=0.9 1.59÷0.3=5.3 0.5×101=50.5 6.5﹣5=1.5
10﹣8.88﹣0.12=1 0.64÷1.6×1.5=0.6
48.【解答】解:0.38×0.25=0.095150×0.12=18 0.87
×1.9=1.6531.28×2.3=2.9442.07×
0.24=0.49680.17×1.05=0.1785 49.【解答】解:①8×
0.12=0.96 ②1.9×
3.5=6.65③0.401×0.3=0.1203④0.45×
0.96=0.432⑤0.17×0.71=0.1207
0.32÷2=0.16
50.【解答】解: 0.8×5=4 8m﹣6m=2m
0.13×0.2=0.026 1﹣0.9=0.1 0.9×0.1=0.09 1.62﹣0.62=1
3.11+2.22=5.33 0.52=0.25 5.9+4.4=10.3
0.053×100=5.3 12.5+12.5×7=100
)))))))))
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