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Add and Subtract Whole Numbers

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vocabulary
definition
Sum   The answer to an addition problem  
Difference   The answer to a subtraction problem  
Estimate   to find an answer close to an exact answer  
Round   To replace a number with a number that tells about how many or how much  
Front - end estimation   When you add or subtract the front digit of each number to get an estimation  


   


 

 

 

 

 

 
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