Name
Homework
10.4
Date
Decide When to Regroup
If there are 10 or more ones, you need to regroup.
to show tens.
Solve. Use 10 attached
Use single
to show ones.
Show
both
numbers.
Add the ones.
How many tens and
ones are there?
1
1.
16 + 9
2.
39 + 4
tens
3.
24 + 5
4.
66 + 6
ten
15
ones
Do you
need to
regroup?
Yes
No
ones
Yes
No
tens
ones
Yes
No
tens
ones
Yes
No
What is
the sum?
25
5. Place 29 beans in rows of 10, 10, and 9. Then add
8 more beans. How many beans do you have in all?
Regroup to solve.
beans
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Use with text pages 271–272.