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
John has 12 apples. Joan gives him 20 apples. He 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
Sally has 23 frogs. She catches 18 more. She has this many frogs now.
Draw an open number line to solve.
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
Joel has 16 erasers. He buys 30 more. He has this many erasers now.
Draw an open number line to solve.
46.
7 tens + 3 tens =
10 tens or 100
If you start at 43 and move 3 rows down the hundred chart, you end on this number. What is the number you land on?
73,
43+10=53
53+10=63
63+10=73
ll... + lll
What is 53
54 + 30 =
84
Suzie has 52 marbles. She wins 13 more. She has this many marbles now.
Draw an open number line to solve.
65
3 tens + 100
13 tens or 130
Answer 23 + 70 =, Make sure to show your work
What is 93
lll...... + llll.....+300
What is 381
37 + 29 =
66
Linda has 45 cupcakes. Jill gives her 13 more. She has this many cupcakes to share with her class.
Draw an open number line to solve.
58