1. 直接写出得数。
0.25÷0.5＝
0.5×0.6＝
1.3×3＝
0.24×2＝
0.07×0.3＝
5.6÷0.7＝
0.8÷0.02＝
0.18÷0.3＝
0.25÷0.5＝
0.5
0.5×0.6＝
0.3
1.3×3＝
3.9
0.24×2＝
0.48
0.07×0.3＝
0.021
5.6÷0.7＝
8
0.8÷0.02＝
40
0.18÷0.3＝
0.6
答案：0.5
0.3
3.9
0.48
0.021
8
40
0.6
0.3
3.9
0.48
0.021
8
40
0.6
2. 用竖式计算。
0.074×0.15______
0.9÷0.75______
2.07÷0.23______
0.074×0.15______
0.9÷0.75______
2.07÷0.23______
答案：
=0.0111
=1.2
=9
=0.0111
=1.2
=9
3. 下面各题,怎样算简便就怎样算。
0.25×1.58×4______
78.5×0.8－8.5×0.8______
99×1.24＋1.24______
4.35＋0.17＋0.65＋0.83______
3.6÷[0.25×(17.3＋30.7)]______
0.25×1.58×4______
78.5×0.8－8.5×0.8______
99×1.24＋1.24______
4.35＋0.17＋0.65＋0.83______
3.6÷[0.25×(17.3＋30.7)]______
答案：=0.25×4×1.58
=1×1.58
=1.58
=(78.5-8.5)×0.8
=70×0.8
=56
=1.24×(99+1)
=1.24×100
=124
=(4.35+0.65)+(0.17+0.83)
=5+1
=6
=3.6÷(0.25×48)
=3.6÷12
=0.3
=1×1.58
=1.58
=(78.5-8.5)×0.8
=70×0.8
=56
=1.24×(99+1)
=1.24×100
=124
=(4.35+0.65)+(0.17+0.83)
=5+1
=6
=3.6÷(0.25×48)
=3.6÷12
=0.3
(1)下面积最大的乘法算式是(
A.6.6×1.01
B.6.6×0.9
C.6.6×1
A
)。A.6.6×1.01
B.6.6×0.9
C.6.6×1
答案：A
(2)下面与8.72÷0.8的得数相等的算式是(
A.87.2÷0.8
B.87.2÷8
C.872÷8
B
)。A.87.2÷0.8
B.87.2÷8
C.872÷8
答案：B
(3)下面与8.8÷0.1的得数相等的算式是(
A.8.8×0.1
B.8.8÷10
C.8.8×10
C
)。A.8.8×0.1
B.8.8÷10
C.8.8×10
答案：C
(4)下面与8.98×5.8的得数最接近的算式是(
A.8×5
B.8×6
C.9×6
C
)。A.8×5
B.8×6
C.9×6
答案：C