Adding Tens
3 tens + 5 tens=
8 tens
You do this to add 10 on a hundred chart.
go down one row
llll + ll
60
20 + 32 =
52
John has 12 apples. Joan gives him 20 apples. He has this many apples now.
32 apples
2 tens + 3 tens =
5 tens
You move 4 rows down the hundred chart to add this many.
40
.... + ......
10
38 + 5 =
43
Sally has 23 frogs. She catches 8 more. She has this many frogs now.
31 frogs
8 tens + 1 ten =
9 tens
To add 20, you move this many rows down the hundred chart.
2 rows
lllll + lll.....
85
61 + 9 =
70
Joel has 16 erasers. He buys 30 more. He has this many erasers now.
46 erasers
7 tens + 3 tens =
10 tens
If you start at 43 and move for rows down the hundred chart, you end on this number.
83
ll... + lll
53
54 + 30 =
84
Suzie has 52 marbles. She wins 10 more. She has this many marbles now.
62 marbles
3 tens + 40 =
70
23 + 70 =
93
lll...... + llll.....
81
30 + 29 =
59
Linda has 8 cupcakes. Jill gives her 13 more. She has this many cupcakes to share with her class.
21 cupcakes