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Worksheet: Addition of Three Numbers within 20

Q1:

18 students are wearing colored tops for a game.

There are 7 red tops, some green tops, and 5 blue tops.

Find the addition sentence that matches this story.

  • A
  • B
  • C

How many green tops are there?

Q2:

19 first graders went to a sports day. 3 of them did the long jump, 11 ran in a race, and others did the high jump.

Answer the following questions to complete the addition expression.

What number belongs in the first box?

  • A
  • B
  • C

How many students did the high jump?

  • A
  • B
  • C

Q3:

Find the three numbers from 4, 1, 7, 9, and 2 whose sum is 10.

  • A4, 2, 1
  • B7, 2, 9
  • C4, 2, 9
  • D7, 2, 1

Q4:

Olivia has 3 chocolates, 7 lollipops, and 6 fruit candies. In total, she has 3 + 7 + 6 pieces of candy.

Find the picture that shows the amount of candy she has.

  • A