算一算。
$0.1×7=$
$0.9×7=$
$0.8×1=$
$0.3×2=$
$0.6×2=$
$0.4×6=$
$0.6×4=$
$0.3×8=$
$0.5×7=$
$0.11×3=$
$0.1×9=$
$0.2×9=$
$0.9×8=$
$0.21×4=$
$0.3×5=$
$0.7×3=$
$0.6×9=$
$0.8×4=$
$0.2×6=$
$0.7×6=$
$0.9×2=$
$0.9×3=$
$0.9×5=$
$0.4×7=$
$0.5×2=$
$0.1×3=$
$0.25×1=$
$0.4×3=$
$0.8×7=$
$0.5×4=$

1. 0.7
2. 6.3
3. 0.8
4. 0.6
5. 1.2
6. 2.4
7. 2.4
8. 2.4
9. 3.5
10. 0.33
11. 0.9
12. 1.8
13. 7.2
14. 0.84
15. 1.5
16. 2.1
17. 5.4
18. 3.2
19. 1.2
20. 4.2
21. 1.8
22. 2.7
23. 4.5
24. 2.8
25. 1
26. 0.3
27. 0.25
28. 1.2
29. 5.6
30. 2

算一算。
0.3×0.6=
0.5×0.7=
0.1×0.1=
0.3×0.9=
0.2×0.7=
0.2×10=
0.8×0.7=
0.5×0.6=
0.6×0.9=
0.4×0.9=
0.7×0.9=
0.6×0.7=
0.5×0.5=
0.2×0.1=
0.3×0.8=
0.7×0.3=
0.1×0.6=
0.1×0.3=
0.3×0.3=
0.8×0.8=
0.5×0.3=
0.4×0.2=
0.6×0.8=
0.7×0.4=
0.4×0.1=
0.9×0.9=
0.6×0.6=
0.8×0.2=
0.5×0.8=
0.4×0.6=

1. 0.18
2. 0.63
3. 0.15
4. 0.35
5. 0.42
6. 0.08
7. 0.01
8. 0.25
9. 0.48
10. 0.27
11. 0.02
12. 0.28
13. 0.14
14. 0.24
15. 0.04
16. 2
17. 0.21
18. 0.81
19. 0.56
20. 0.06
21. 0.36
22. 0.3
23. 0.03
24. 0.16
25. 0.54
26. 0.09
27. 0.4
28. 0.36
29. 0.64
30. 0.24