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