+1
12 + 1
13
12 + 2
14
12+3
15
12-1
11
What place value is the 2?
12 ones
15 + 1
16
15 + 2
17
15 + 3
15 - 1
14
What place value is the 1?
15 tens
19 + 1
20
19 + 2
21
19 + 3
22
19 - 1
18
What place value is each number? 1 9
1 = tens 9 = ones
27 + 1
28
27 + 2 =
29
27 + 3
30
27 - 1
28
Count by tens to 100!