Addition And Subtraction Problems Worksheet Page 13
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402-4
Add Whole Numbers
Hands-On Mini Activity
The model shows
Hundreds
Tens
Ones
MAIN IDEA
135 + 127.
I will add numbers,
1. Estimate 135 + 127.
including multi-digit
numbers.
2. To find 135 + 127,
is it necessary to
1
3
5
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regroup the ones?
How do you know?
• Extra Examples
3. Is it necessary to
• Personal Tutor
• Self-Check Quiz
regroup the tens?
+
1
2
7
How do you know?
When you add whole numbers, it may be necessary to regroup.
EXAMPLE
Add Whole Numbers
1
Find 6,824 + 349.
Estimate
6,824
6,800
+ 349
+ 300
7,100
Step 1 Add ones.
Step 3 Add hundreds.
1
1
1
8 + 3 = 11
4 + 9 = 13
6,824
6,824
Regroup 11
Regroup 13 ones as
349
+
+ 349
hundreds as 1
1 ten and 3 ones.
3
173
thousand and
1 hundred.
Step 4 Add thousands.
Step 2 Add tens.
1
1
1
6,824
6,824
1 + 2 + 4 = 7
6 + 1 = 7
+ 349
+ 349
7,173
73
Check for Reasonableness
The estimate is 7,100. Since 7,173 is close to the estimate, the answer
is reasonable.
64 Chapter 2 Solve Addition and Subtraction Problems
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