When adding four-digit numbers, you may need to regroup the hundreds as thousands.
Always work from right to left.
Look at the example below.
First add the ones!
TH
H
T
O
1
5
2
8
4
8
3
3
11
Regroup the ten!
TH
H
T
O
1
1
5
2
8
4
8
3
3
1
Next add the tens!
TH
H
T
O
1
1
5
2
8
4
8
3
3
6
1
Now add the hundreds!
TH
H
T
O
1
1
5
2
8
4
8
3
3
13
6
1
Regroup the 10 hundreds!
TH
H
T
O
1
1
1
5
2
8
4
8
3
3
3
6
1
Add the
thousands!
TH
H
T
O
1
1
1
5
2
8
4
8
3
3
6
3
6
1
Complete the problems below.
First add the ones!
TH
H
T
O
2
4
5
7
5
7
6
8
Carry the ten!
TH
H
T
O
2
4
5
7
5
7
6
8
5
Next add the tens!
TH
H
T
O
1
2
4
5
7
5
7
6
8
5
Regroup the tens!
And add the hundreds!
TH
H
T
O
1
2
4
5
7
5
7
6
8
2
5
Carry the 10 hundreds!
TH
H
T
O
1
1
2
4
5
7
5
7
6
8
2
2
5
Add the thousands!
TH
H
T
O
1
1
1
2
4
5
7
5
7
6
8
2
2
5
TH
H
T
O
1
9
8
5
3
2
4
6
TH
H
T
O
1
6
4
5
2
7
8
5
TH
H
T
O
3
9
7
5
4
3
4
7
TH
H
T
O
2
8
8
8
4
7
6
5
TH
H
T
O
3
5
5
5
3
6
7
8
TH
H
T
O
2
7
9
8
3
6
6
6
4
4
4
3
4
6
7
8
3
3
3
9
5
8
9
4
2
7
3
1
3
4
6
9
2
4
5
6
3
5
7
9
1
3
5
7
2
4
6
8
2
5
7
5
4
5
2
5
3
4
3
4
3
5
3
5
2
1
2
1
1
9
1
9
2
7
2
9
3
4
3
5
2
9
9
9
3
9
8
7
1
2
3
4
7
8
9
1
3
7
7
7
4
4
5
6
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