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In this lesson, we will learn how to use 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.
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