Lesson Worksheet: Subtracting by Adding with Numbers up to 20 Mathematics • 1st Grade

In this worksheet, we will practice solving subtraction problems by finding the missing part in an addition expression with numbers up to 20.

Q1:

Matthew had 17 toy cars.

He lost 6 of the cars.

He can work out how many cars are left by completing either number sentence: 176=,6+=17.

How many cars are left?

Q2:

Isabella built 13 sandcastles on the beach. The tide came in and washed some of them away. There are 7 left and she wants to know how many were washed away.

Which of these number sentences does she need to solve?

  • A137=
  • B7+13=
  • C713=
  • D13+7=

Which of these addition facts can help her to solve the problem?

  • A7+6=13
  • B13+7=20
  • C6+13=19

How many sandcastles were washed away?

Hint: Use 7+6=13 to solve 137=.

Q3:

Hannah and Anthony made 19 cupcakes.

After their dog ate some, there were 15 left.

They want to know how many cakes their dog ate.

Who is correct?

  • Aonly Anthony
  • BThey are both wrong.
  • CThey are both correct.
  • Donly Hannah

Q4:

We know that 4+9=13.

What is 139?

Q5:

We know that 5+7=12.

What is 127?

Q6:

Which of the following addition sentences can help you solve 195?

  • A19+14
  • B19+5
  • C5+14

What is the result of 195?

Q7:

Complete the following using 19=5+14 to help you: 195=.

Q8:

Find the missing number in the given model.

Write an addition fact to prove your answer.

  • A9+9=18
  • B9+8=18
  • C18+9=9

Q9:

Which of the following calculations can help you check if 125=7 is correct?

  • A12+5=7
  • B12+7=5
  • C5+7=12

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