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Write the Estimated & Actual Sum for 3-Digit Addends

Name Grade School
Date Questions10 Score
example
Addition
326
+  513
sum
Estimated Sum
300
+  500
800
Actual Sum
326
+  513
839
1
Addition
624
+  306
sum
Estimated Sum

  
 
Actual Sum

  
 
2
Addition
576
+  505
sum
Estimated Sum

  
 
Actual Sum

  
 
3
Addition
359
+  612
sum
Estimated Sum

  
 
Actual Sum

  
 
4
Addition
249
+  222
sum
Estimated Sum

  
 
Actual Sum

  
 
5
Addition
511
+  620
sum
Estimated Sum

  
 
Actual Sum

  
 
6
Addition
643
+  511
sum
Estimated Sum

  
 
Actual Sum

  
 
7
Addition
332
+  729
sum
Estimated Sum

  
 
Actual Sum

  
 
8
Addition
223
+  555
sum
Estimated Sum

  
 
Actual Sum

  
 
9
Addition
554
+  525
sum
Estimated Sum

  
 
Actual Sum

  
 
10
Addition
412
+  503
sum
Estimated Sum

  
 
Actual Sum

  
 

Answers Key
1
Addition
624
+  306
sum
Estimated Sum
600
+  300
900
Actual Sum
624
+  306
930
2
Addition
576
+  505
sum
Estimated Sum
600
+  500
1100
Actual Sum
576
+  505
1081
3
Addition
359
+  612
sum
Estimated Sum
400
+  600
1000
Actual Sum
359
+  612
971
4
Addition
249
+  222
sum
Estimated Sum
200
+  200
400
Actual Sum
249
+  222
471
5
Addition
511
+  620
sum
Estimated Sum
500
+  600
1100
Actual Sum
511
+  620
1131
6
Addition
643
+  511
sum
Estimated Sum
600
+  500
1100
Actual Sum
643
+  511
1154
7
Addition
332
+  729
sum
Estimated Sum
300
+  700
1000
Actual Sum
332
+  729
1061
8
Addition
223
+  555
sum
Estimated Sum
200
+  600
800
Actual Sum
223
+  555
778
9
Addition
554
+  525
sum
Estimated Sum
600
+  500
1100
Actual Sum
554
+  525
1079
10
Addition
412
+  503
sum
Estimated Sum
400
+  500
900
Actual Sum
412
+  503
915

Worksheet for Estimate the Sum by Nearest Hundred

Estimated sum of 3-digit numbers addition by rounding to the nearest hundred worksheet with answers to practice & learn 3rd grade math problems on estimation is available online for free in printable & downloadable (pdf & image) format. Tap on PRINT, PDF or IMAGE button to print or download this 3rd grade estimated addition worksheet for quick approximation by rounding the 3-digit addends to the nearest 100.

How to Use this Worksheet

In this third grade math worksheet, students are required to write the estimated sum & actual sum for the given 3-digit addends by rounding off to the nearest hundred as like in the given solved example of this online workbook for estimation problems. To find the estimated sum, round the given 3-digit addends to the nearest hundred numbers and then perform the addition. To find the actual sum, add the given 3-digit addends directly and write the sum.

Answers Key

Teachers, parents or students can check or validate the completed math workbook containing the 3rd grade math questions for writing estimated & actual sum for 3-digit addition by using the corresponding answers key.

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