Commutative
3 + 6 = 9
6 + 3 = 9
7 + 3 + 2 =
10 + 2 = 12
7 + 3
10
What is this number: 17
Seventeen
9 + 3 = 12
3 + 9 = 12
9 + 4 + 1 =
10 + 4 = 14
8 + 6 =
14
What does this sign mean: =
Equal to; the same
8 + 9 = 17
9 + 8 = 17
4 + 7 + 6 =
10 + 7 = 17
6 + 4 + 7 =
17
How many ones are in the number 16?
Six
17 + 4 = 21
4 + 17 = 21
2 + 8 + 8 =
10 + 8 = 18
7 + 9 + 3 =
19
How many groups of ten are in the number 14?
One
5 + 5 = 10
5 + 5 = 10
10 + 5 + 5 =
10 + 10 =
8 + 4 + 2 =
14
What is this number: 87
Eighty-Seven