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.

  • A
  • B
  • C

How many green tops are there?

Q2:

Complete the following: 1 + 5 + 4 = .

  • A9
  • B2
  • C0
  • D10

Q3:

Adel bought 3 bananas, 5 apples, and 6 oranges. How many pieces of fruit did he buy?

Q4:

The pictures show how many of each type of animal are at a farm.