10 ×
2
4
4
3 ×
1
3
15 ×
5
5
2
2
12 ×
4
1
3
20 ×
4
5
3
8 ×
2
2 ÷
1
3 ÷
1
15 ×
3
5
4
2
3
2 ÷
1
2
20 ×
5
4