Regrouping
Add 16+15
31
3 tens + 2 tens
5 tens (50)
9 tens-2 tens
7 tens
42+3
45
Mrs. Stock has 40 stickers and gives 30 to her students. How many does she have left?
10 stickers
Add 13+19
32
6 tens + 4 tens
10 tens (100)
70-30
40
62+4
66
There are 17 students in Mrs. Stockburger's class. 11 of them are girls. How many are boys?
6 boys
Add 17+18
35
40 + 50
90
4 tens-2 tens
2 tens
73+5
78
Makenna has 22 toys and gets 4 more for her birthday. How many does she have now?
26 toys
52
4 tens + 1 ten
5 tens
10 tens - 2 tens
8 tens
29+4
33
20 school days
Add 43+19
62
70+40
110
90-40
50
55+2
57
Mrs. Stockburger has 57 books and gets 6 more new books. How many books does she have now?
63 books