Word Problems: Add & Subtract Within 20 — Answer Key
Part A: Solve the Word Problems
Read each problem. Use the box to show your work. Write the answer.
1. Mia has 4 red crayons and 3 blue crayons. How many crayons does she have in all?
Answer: 7 crayons
Add the two groups together: 4 + 3 = 7 crayons in all.
2. There are 5 birds in a tree. Then 2 more birds fly over. How many birds are there now?
Answer: 7 birds
Add the birds that flew over: 5 + 2 = 7 birds in all.
3. Sam picks 6 apples. Lily picks 4 apples. How many apples do they have together?
Answer: 10 apples
Add both groups of apples together: 6 + 4 = 10 apples.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. The words 'in all' tell us to add.
The phrase 'in all' is an addition clue word that means to combine groups.
2. The words 'how many together' tell us to add.
The phrase 'how many together' means to join groups, which is addition.
3. 3 + 5 = 8
When you add 3 and 5, you get 8.
Part C: True or False
Circle True or False for each statement.
1. 4 + 3 is the same as 3 + 4.
True False
This is true because you can add numbers in any order and still get the same answer: both equal 7.