Addition
10 + 5
fifteen
10 − 3
7
1, 2, ___, 4
Before 10
nine
0
zero / oh
23+12
35
25 − 7
18
10, 20, ___, 40
thirty
After 19
20
12
twelve
45+18
63
50 − 18
32
35, 36, ___, 38
thirty-seven
Before 30
29
14
fourteen
55+30
85
80 − 35
45
60, 70, ___, 90
eighty
After 58
59
40
forty
68 + 27
95
92 − 47
45
95, 96, ___, 98
ninety - seven
Before 100
99
100
one hundred