Adding Tens
3 tens + 5 tens=
8 tens or 80
You do this to add 10 on a hundred chart.
Go down one row.
llll + ll
What is 60?
20 + 32 =
What is 52
Mrs. Pesaud has 12 apples. Mrs. Mankulish gives her 20 apples. She has this many apples now.
What is 32 apples?
2 tens + 3 tens =
5 tens or 50
Start at 25, Move down 2 rows. Where are you now?
45,
first 25 +10=,
35+10=,
,45
.... + ......
What is 10?
38 + 40 =
78
Mrs. Kahn has 23 frogs. She catches 18 more. She has this many frogs now.
41
80 + 1 ten =
9 tens or 90
To add 40, you move this many rows down the hundred chart.
4 Rows
lllll + lll.....
What is 85?
61 + 42 =
What is 103
Mrs. Ramienski has 16 erasers. She buys 30 more. She has this many erasers now.
46.
7 tens + 3 tens =
10 tens or 100
Start at 43 and move 3 rows down the hundred chart, you end on this number.
73,
43+10=53
53+10=63
63+10=73
ll... + lll
What is 53?
54 + 30 =
84
Mrs. Howe has 52 marbles. She finds 13 more. She has this many marbles now.
65
3 tens + 100
13 tens or 130
If you start at 23 and go down 7 spaces, you are at this number.
What is 93
lll...... + llll
What is 76?
37 + 29 =
66
Mrs. Corrado has 15 cupcakes. Mrs. Speiden gives her 13 more. She has this many cupcakes to share with her class.
28