20 ×
5
4
6 ×
3
2
21 ×
7
42 ×
6
2 ÷
1
2 ÷
4
210×
1
30 ×
6
5
3
7
2
2
6
2 ÷
1
12 ×
3
4
35 ×
5
7
6
6
7
2
840×
4
5
12 ×
1
3
21 ×
3
5
7
6
2 ÷
1
2
4
1
2
2
28 ×
4
7
2 ÷
6
3
30 ×
5
7
15 ×
3
5
8 ×
1
2
4
6