1. 直接写出得数。(32☆)
5.8-2.3=
9.4-3.1=
7.2-4.5=
6.7-1.2=
8.5-3.4=
4.9-2.7=
10.3-5.6=
12.8-7.5=
60.8×100=
0.073×1000=
0.081×10=
0.95×100=
0.8×0.7=
0.6×0.9=
0.5×0.8=
0.4×0.7=
0.3×0.9=
0.2×0.8=
0.7×0.6=
0.9×0.5=
5.9×2=
6.7×2=
8.9×2=
2.4×3=
1.3×0.2=
5.3×0.3=
7.1×0.3=
9.2×0.3=
2.1×0.3=
4.3×0.2=
6.5×0.4=
8.7×0.3=

1. 5.8-2.3=3.5
9.4-3.1=6.3
7.2-4.5=2.7
6.7-1.2=5.5
8.5-3.4=5.1
4.9-2.7=2.2
10.3-5.6=4.7
12.8-7.5=5.3
60.8×100=6080
0.073×1000=73
0.081×10=0.81
0.95×100=95
0.8×0.7=0.56
0.6×0.9=0.54
0.5×0.8=0.4
0.4×0.7=0.28
0.3×0.9=0.27
0.2×0.8=0.16
0.7×0.6=0.42
0.9×0.5=0.45
5.9×2=11.8
6.7×2=13.4
8.9×2=17.8
2.4×3=7.2
1.3×0.2=0.26
5.3×0.3=1.59
7.1×0.3=2.13
9.2×0.3=2.76
2.1×0.3=0.63
4.3×0.2=0.86
6.5×0.4=2.6
8.7×0.3=2.61

2. 下面各题中积的小数位数对吗？对的画“√”，错的在括号里更正。(6☆)
1.56×23.6=368.16()
1.96×0.9=1.764()
0.85×6.1=51.85()
48.7×58=2824.6()
9.2×3.9=3.588()
0.62×0.89=5.518()

2. 1.56×23.6=368.16(36.816)
1.96×0.9=1.764(√)
0.85×6.1=51.85(5.185)
48.7×58=2824.6(√)
9.2×3.9=3.588(35.88)
0.62×0.89=5.518(0.5518)

3. 列竖式计算。（12☆）
3.4×4.85=
5.3×3.9=
2.77×4.7=
47.6×1.4=
6.36×2.5=
5.76×1.8=
用时：分钟 ★共得：☆/50 ☆

3. 3.4×4.85=16.49
5.3×3.9=20.67
2.77×4.7=13.019
47.6×1.4=66.64
6.36×2.5=15.9
5.76×1.8=10.368