20 ×
5
4
6 ×
3
1
10 ×
2
4 ÷
4
6 ×
3
5 ×
1
2
5
1
2
5
12 ×
3
12 ×
4
30 ×
3
5
2
4
1
2 ×
2
1
20 ×
4
5
3