①0.27×0.45=0.1215;
0.2 7
×
0.4 5
1 3 5
1 0 8 0.1 2 1 5
②3.05×2.4=7.32;
3.0 5
×
2.4
1 2 2 0
6 1 0 7.3 2 0
验算:
2.4
×
3.0 5
1 2 0
7 2 7.3 2 0
③0.51÷0.12=4.25.
4.2 5
12
5 1
4 8 3 0
2 4 6 0
6 0 0
④6.24÷0.4=15.60.
15.6
4
6 2.4
4 2 2
2 0 2 4
2 4 0