Worksheet: Checking Two-Digit Subtraction Problems by Adding

In this worksheet, we will practice using addition to check subtraction and identifying the related addition equation that can be solved to check the answer.

Q1:

Look at the expression 7639.

Choose a strategy and solve the expression.

Hint: You can use the vertical column method.

Check your answer using the inverse operation. Remember that inverse means the opposite.

Which addition expression shows the opposite calculation you need to carry out?

  • A 3 7 + 3 9
  • B 3 7 + 7 6
  • C 3 9 + 7 6

Q2:

Sophia and Benjamin have been asked to solve 9645.

Sophia solves it and gets an answer of 51.

Benjamin solves it and gets an answer of 31.

Who is correct? Use the vertical column method to find out.

  • ASophia
  • BBenjamin

Check your answer using the inverse operation.

What number do you add to 45 to get 96?

Q3:

If you know that 4615=31, find the total of 15+31 without calculating.

Q4:

What is the number that can fill in the empty places?

Q5:

There are 58 trees in the street. 14 trees are being cut down. How many trees will be left in the street?

Hint: After you subtract check your answer by adding. 5814=14+=58

Q6:

I think that 7229=43.

Pick the number sentence I can use to check my answer.

  • A 7 2 + 2 9 = 4 3
  • B 4 3 + 2 9 = 7 2
  • C 4 3 2 9 = 7 2
  • D 4 3 + 7 2 = 2 9

Q7:

Find the number that fills in the blanks.

Hint: Subtract, then add to check.

Q8:

Find the number that fills in the blank.

Hint: Subtract, then add to check.

Q9:

A classroom has 35 students. If 13 of them are boys, how many girls are there?

Pick the equation which can be used to check your answer.

  • A 6 6 + 1 3 = 3 5
  • B 2 2 + 1 3 = 3 5
  • C 2 2 1 3 = 3 5
  • D 6 5 + 1 3 = 3 5
  • E 1 3 + 3 5 = 2 2

Q10:

You know that 3724=13. Is it true that 13+24=37?

  • AYes
  • BNo

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