Worksheet: Addition of Three Numbers within 20

In this worksheet, we will practice using strategies for adding two numbers when adding three numbers whose sum is at most 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.

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?

How many students did the high jump?

Q3:

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

Q4:

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

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