1. 直接写出得数。
0.5×9=
0.8×2=
7×0.7=
0.1×3=
5×0.4=
0.2×3=
8×0.9=
0.6×2=
7×0.9=
0.9×2=
8×0.8=
0.1×4=
9×0.9=
0.4×9=
0.5×7=
9×0.7=
0.7×80=
0.9×10=
2.4×50=
0.3×7=
1.6×8=

0.5×9=4.5
0.8×2=1.6
7×0.7=4.9
0.1×3=0.3
5×0.4=2
0.2×3=0.6
8×0.9=7.2
0.6×2=1.2
7×0.9=6.3
0.9×2=1.8
8×0.8=6.4
0.1×4=0.4
9×0.9=8.1
0.4×9=3.6
0.5×7=3.5
9×0.7=6.3
0.7×80=56
0.9×10=9
2.4×50=120
0.3×7=2.1
1.6×8=12.8

2. 涂一涂，算一算。
(1)0.8×3=()
0.8是()个0.1
3个0.8是()个0.1，也就是()

(2)0.01×40=()

(1)
$0.8×3=2.4$
0.8是8个0.1
3个0.8是24个0.1，也就是2.4
（涂图：将三个长方形各自的8份涂色）
(2)
$0.01×40=0.4$
（涂图：在100格正方形中涂40个小格）

3. 在○里填上“＞”“＜”或“＝”。
7×0.7○0.2×8
0.4×8○0.3×9
0.9×7○6×0.8
0.5×1○0.1×2
0.5×3○0.06×5
0.9×1○3×0.7
0.2×2○0.7×4
5×0.03○6×0.3
2×0.02○0.2×2
4×0.07○0.2×3

7×0.7=4.9，0.2×8=1.6，7×0.7＞0.2×8
0.4×8=3.2，0.3×9=2.7，0.4×8＞0.3×9
0.9×7=6.3，6×0.8=4.8，0.9×7＞6×0.8
0.5×1=0.5，0.1×2=0.2，0.5×1＞0.1×2
0.5×3=1.5，0.06×5=0.3，0.5×3＞0.06×5
0.9×1=0.9，3×0.7=2.1，0.9×1＜3×0.7
0.2×2=0.4，0.7×4=2.8，0.2×2＜0.7×4
5×0.03=0.15，6×0.3=1.8，5×0.03＜6×0.3
2×0.02=0.04，0.2×2=0.4，2×0.02＜0.2×2
4×0.07=0.28，0.2×3=0.6，4×0.07＜0.2×3