What number is it?
8
What number is it?
14
What number is it?
8
What number is it?
9
What number is it?
2
What number is it?
17
Subtract
9
What number is it?
15
Subtract
11
What number is it?
7
What number is it?
8
Subtract
9
What number is it?
7
Subtract
19