Numbers

2-76 Adding Three-Digit Numbers

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To find the sum of three-digit numbers, first add the ones. 

 

2 4 3
6 1 4
+ _____
7

Then add the tens.

2 4 3
6 1 4
+ _____
5 7

Then add the hundreds.

2 4 3
6 1 4
+ _____
8 5 7

 

Practice adding three digit numbers.  Fill in the boxes below.

1 3 5
4 2 0
+ _____
5 5
4 3 7
3 5 2
+ _____
7
7 5 6
1 4 3
+ _____

 

1 2 8
3 4 1
+ _____
2 9 3
3 0 6
+ _____
1 8 4
6 1 5
+ _____

 

2 2 7
3 5 2
+ _____
1 9 3
6 0 6
+ _____
4 2 7
5 6 2
+ _____

 

 

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