Teens
10 and a 5
15
The extra in 15?
5
What 2 numbers make 11?
10 and 1
What number comes after 15?
16
10 and a 8
18
The extra in 18?
8
What 2 numbers make 15?
10 and 5
What number comes after 18?
19
10 and a 9
19
The extra in 17?
7
What 2 numbers make 18?
10 and 8
What number comes after 12?
13
10 and a 3
13
The extra in 13?
3
What 2 numbers make 16?
10 and 6
What number comes after 14?
15
10 and a 7
17
The extra in 14?
4
What 2 numbers make 12?
10 and 2
What number comes after 19?
20