Counting by 10
When counting by 10, this number comes after 10.
20
9 - 8 =
1
10 + 3 =
13
What number is one less than 2?
What number is this? 32
Thirty-two
When counting by 10, this number comes after 30.
40
8 - 5 =
3
7 + 5 =
12
What number is one greater than 11?
12
What number is this? - 61
Sixty-one
When counting by 10, this number comes after 50.
60
There are 7 birds in a tree. 7 birds fly away. How many birds are left?
0
9 + 4 =
13
What number is 2 greater than 20?
22
What number is this? 78
Seventy-eight
When counting by 10, this number comes before 80.
70
There are 10 kids in a room. Five take a nap. How many are awake?
5
15 + 1 =
16
What number is one greater than 99?
100
What number is this? - 45
Forty-five
When counting by 10, this number comes before 60.
50
100 - 100 =
0
17 + 3 =
20
What number is two greater than 32?
34
What number is this? - 91
Ninety-one