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Checking Subtractions (2)

In this worksheet, students must use additions to check subtractions. Three-digit numbers are used.

'Checking Subtractions (2)' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

From any addition fact such as

135 + 423 = 558

 

we can work out two subtraction facts.

 

Here we get

558 - 135 = 423

and

558 - 423 = 135

 

This is handy because we can use additions to check subtractions.

 

 

Example 1

Anna says that

 

433 - 115 =     318     

 

Use addition to check if she is right or wrong.

 

Answer

318 + 115 = 433

 

So Anna is right.

 

 

Example 2

Ben says that

 

514 - 325 =     219     

 

Use addition to check if he is right or wrong.

 

Answer

219 + 325 = 544 not 514

 

So Ben is wrong.

Anna says that

 

123 - 15 =     107     

 

Use addition to check if she is right or wrong.

right

wrong

Ben says that

 

235 - 116 =     119     

 

Use addition to check if he is right or wrong.

right

wrong

Caroline says that

 

437 - 15 =     422     

 

Use addition to check if she is right or wrong.

right

wrong

Derek says that

 

341 - 212 =     139     

 

Use addition to check if he is right or wrong.

right

wrong

Emir says that

 

414 - 15 =     399     

 

Use addition to check if he is right or wrong.

right

wrong

Fatima says that

 

764 - 312 =     452     

 

Use addition to check if she is right or wrong.

right

wrong

Gill says that

 

562 - 476 =     94     

 

Use addition to check if she is right or wrong.

right

wrong

Henry says that

 

548 - 169 =     379     

 

Use addition to check if he is right or wrong.

right

wrong

Indy says that

 

794 - 48 =     744     

 

Use addition to check if she is right or wrong.

right

wrong

Jamir says that

 

572 - 375 =     197     

 

Use addition to check if he is right or wrong.

right

wrong

  • Question 1

Anna says that

 

123 - 15 =     107     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
107 + 15 = 122 not 123
  • Question 2

Ben says that

 

235 - 116 =     119     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
119 + 116 = 235
  • Question 3

Caroline says that

 

437 - 15 =     422     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
422 + 15 = 437
  • Question 4

Derek says that

 

341 - 212 =     139     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
139 + 212 = 351 not 341
  • Question 5

Emir says that

 

414 - 15 =     399     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
399 + 15 = 414
  • Question 6

Fatima says that

 

764 - 312 =     452     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
452 + 312 = 764
  • Question 7

Gill says that

 

562 - 476 =     94     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
94 + 476 = 570 not 562
  • Question 8

Henry says that

 

548 - 169 =     379     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
379 + 169 = 548
  • Question 9

Indy says that

 

794 - 48 =     744     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
744 + 48 = 792 not 794
  • Question 10

Jamir says that

 

572 - 375 =     197     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
197 + 375 = 572
---- OR ----

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