Numbers

2-36 Checking Addition

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Remember: The order of addition does not change the sum.

2 + 4 = 6 and 4 + 2 = 6.

You can check an addition problem by writing the addends in opposite order and adding again.

Look at the problem below.

43

+ 56

wpe5.gif (1234 bytes)

   56

+ 43

99

   99

 

Complete the problems below.

 

17        21   35   26   23
+ 21   + + 45   + 64 +   + 19

38

38   80 80   90   42 42
                     
69     44   87
+ 24 +   + 67 + 25   + +   + 11 +
93   92   63 63  

 

 

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