Numbers

1-51 Two-Digit Addition

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Use addition facts to add two digit numbers.

2 4
+ 4 1

Look at the problem below.

 

TENS ONES
2 4
4 1
Plus70.gif (932 bytes)

 

First you add the 4 and the 1 in the ONES place value.

 

TENS ONES
2 4
4 1
Plus70.gif (932 bytes)
5

 

4 + 1 = 5

 

Then you add the 2 and the 4 in the TENS place value.

 

TENS ONES
2 4
4 1
Plus70.gif (932 bytes)
6 5

 

2 + 4 = 6

 

To add a two digit number and a one digit number you add the ONES place value first.

 

TENS ONES
3
2 5
Plus70.gif (932 bytes)
8

 

3 + 5 = 8

 

Then bring the 2 down.

 

TENS ONES
3
2 5
Plus70.gif (932 bytes)
2 8

 

0 + 2 = 2

 

Complete the problems below.

 

1  7 2  1 1  4 2  5 1  1 1  7
+ 2  1 +    5 + 2  3 +    4 + 1  2 + 7  1
Spacer.gif (42 bytes)
1  3 2  4 1  5 1  2 4  4 3  7
+ 3  2 + 6  3 + 2  4 + 3  3 + 5  5 + 6  2
Spacer.gif (42 bytes)
4  7 2  3 1  6 4  6 3  7 1  3
+ 3  2 + 4  2 +    3 + 5  1 + 2  2 + 4  3

 

 

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