Worksheet: Adding and Subtracting Numbers up to 20

In this worksheet, we will practice solving problems by deciding whether to add or subtract and then completing equations by adding and subtracting within 20.

Q1:

Mohammed has a bag of 6 sweets and a bag of 9 sweets.

How many sweets does Mohammed have?

Q2:

A pirate found 16 jewels in a treasure chest. But 7 jewels were stolen.

Which picture shows this?

  • A
  • B
  • C
  • D
  • E

How many jewels were left?

Q3:

There were 11 flies. After a frog ate some of them, there were 8 flies left. How many flies were eaten?

Q4:

There are 12 ducks swimming in a pond. 5 of them fly away. Which expression shows how many ducks are still in the pond?

  • A12+5
  • B125

Q5:

Anthony bought some stickers. He gave 3 to his friend and he had 11 left. Find the subtraction sentence that shows this using “?” for the number of stickers he bought.

  • A11 − 3 = ?
  • B? − 3 = 11
  • C14 − 11 = ?

Q6:

Amelia made 12 sandwiches for a picnic. At the end of the day, there were 5 left. Write a subtraction sentence that shows this using “?” for the number of sandwiches that were eaten.

  • A12 − 7 = ?
  • B12 − ? = 5
  • C? − 5 = 12
  • D5 − 7 = ?
  • E7 − 5 = ?

Q7:

Scarlett had 11 toy cars. She was then given some toy boats. In total, she had 15 toy vehicles. Write an addition sentence that shows this using “?” for the number of boats.

  • A? + 4 = 11
  • B11 + ? = 15
  • C11 + 15 = ?
  • D15 + ? = 11
  • E4 + ? = 15

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