Place value
10 + 7 =
17
10
9
2 + 2 =
4
10 - 10 =
0
9 + __ = 10
1
3 tens, 2 ones
32
16
15
4 + 4 =
8
20 - 10 =
10
4 + ___ = 10
6
40 + 9 =
49
34
33
10 + 10 =
20
50 - 10 =
40
2 + ___ = 10
8
6 tens, 0 ones
60
81
80
6 + 6 =
12
14 - 10 =
4
___ + 7 = 10
3
4 ones, 9 tens
94
100
99
9 + 9 =
18
72 - 10 =
62
4 + 1 + ___ = 10
5