Reteaching
Name
4-3
Adding Whole Numbers
You can add more than two numbers when you line up the
numbers by place value and add one place at a time.
Add 3,456 1 139 1 5,547.
Estimate: 3,000 1 100 1 6,000 5 9,100
Step 1
Line up numbers by
place value.
Add the ones.
Step 2
Add the tens.
Regroup if needed.
Step 3
Add the hundreds, then
the thousands.
Continue to regroup.
Regroup if needed.
2
3,456
139
5,547
22 becomes
2 tens and
2 ones.
1 2
2
1 1 2
3,456
139
5,547
3,456
139
5,547
42
9,142
Keep digits in neat
columns as you add.
9,142 is close to the
estimate of 9,100.
Add.
1.
945
124
1 343
1,412
2.
2,588
373
1 866
3,827
4.
5.
2,955
16,699
9,017
3,311
1 248
1 32,484
12,220
52,494
3.
12,566
8,222
1 5,532
26,320
6.
3,881
1,735
1 364
5,980
7. Number Sense Jill added 450 1 790 1 123 and got 1,163.
Is this sum reasonable?
No, the sum should be closer to 1,400.
R 4•3
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