Addition
15 + 6 =
18 + 4
What number comes before 9?
8
12 - 9 =
What is the missing number?
39, 40, 41, ___, 43
42
10, 20, 30, 40, ___
50
18 + 8 =
26
13 + ? = 16
3
What number comes before 20?
19
13 - 7 =
6
What is the missing number?
7, 8, 9, 10, ___, 12, 13, 14, 15, 16
11
2, 4, 6, 8, 10, 12, __
14
14+ 3 =
16
16 - ? = 8
8
What number comes after 59?
60
15 - 10 =
5
What is the missing number?
75, 76, ___, 78, 79
77
10, 20, __, 40, 50, __
30, 60
20 + 10 =
30
? - 5 = 18
23
What number comes before 78?
77
20 - 16 =
4
What is the missing numbers?
15, __, 17, 18, __, 20, 21, 22, 23, 24
16,19
2,__,6, __
4,8
25+4=
29
? - 17 = 22
39
What number comes before 83
82
20-8 =
12
What is the missing number?
74, 75, ___, ___, 78,___,80
76,77,79
10, 20, 30, __,50, 60, __, 80, __
40, 70, 90