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Estimating Sums and Differences

(Whole Numbers)

 

Lesson 1

 

Problem:

 

 347 - 29

Solution
Step 1:  

340 Rounded to nearest whole number is 340.

       

 

Solution
Step 2:          

29  Rounded to nearest whole number is 30.

 

                     

Solution
Step 3:          

Therefore, difference of 340 - 30 is 340 - 30 = 310

 

 

Try two practice problems:

 A.

 

294 - 52

B.  

 

318 + 36

 



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