1's
1
What is 1x1
2x1
What is 2
3
What is 3x1
4x1
What is 4
25
What is 5x5
1x2
What is 2
2x2
What is 4
6
What is 3x2
4x2
What is 8
5x1
What is 5
3
What is 1x3
6
What is 2x3
9
What is 3x3
16
What is 4x4
5x3
What is 15
1x4
What is 4
10
What is 2x5
12
What is 3x4
12
What is 4x3
5x4
What is 20
5
What is 1x5
2x4
What is 8
3x5
What is 15
20
What is 4x5
10
What is 5x2