Say the number
15
fifteen
1, 2, ............
3
5 + 5 =
10
3, 2, ............
1
10 + 2 =
12
8
eight
6, 7, ............
8
5 - 2 =
3
9, 8, ............
7
10 + 3 =
13
17
seventeen
9, 10, ............
11
9 - 1 =
8
5, 4, ............
3
15 + 2 =
17
20
twenty
7, 8, ............
9
4 + 2 =
6
11, 10, ............
9
16 + 4 =
20
13
thirteen
11, 12, ............
13
10 - 9 =
1
14, 13, ............
12
18 - 7 =
11