Checking Subtractions (2)

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

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:

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.

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.

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.

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.

right
EDDIE SAYS
119 + 116 = 235
• Question 3

Caroline says that

437 - 15 =     422

Use addition to check if she is right or wrong.

right
EDDIE SAYS
422 + 15 = 437
• Question 4

Derek says that

341 - 212 =     139

Use addition to check if he is right or wrong.

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.

right
EDDIE SAYS
399 + 15 = 414
• Question 6

Fatima says that

764 - 312 =     452

Use addition to check if she is right or wrong.

right
EDDIE SAYS
452 + 312 = 764
• Question 7

Gill says that

562 - 476 =     94

Use addition to check if she is right or wrong.

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.

right
EDDIE SAYS
379 + 169 = 548
• Question 9

Indy says that

794 - 48 =     744

Use addition to check if she is right or wrong.

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.

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

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