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. Ella has 8 markers. Her friend gives her 5 more. How many markers does Ella have now?
Answer: 13 markers
Add the markers together: 8 + 5 = 13 markers in all.
2. There are 14 children at the park. Then 6 go home. How many children are still at the park?
Answer: 8 children
Subtract the children who left: 14 - 6 = 8 children still at the park.
3. A box has 7 red balls and 5 blue balls. How many balls are in the box in all?
Answer: 12 balls
Add the balls together: 7 + 5 = 12 balls in all.
Part B: Key Words
Fill in the blank with 'add' or 'subtract'.
1. When you see 'in all,' you should add.
The phrase 'in all' means to combine groups, which is addition.
2. When you see 'how many are left,' you should subtract.
The phrase 'how many left' means to take away, which is subtraction.
3. When you see 'how many more,' you should subtract.
The phrase 'how many more' means to find the difference, which is subtraction.
4. When you see 'altogether,' you should add.
The word 'altogether' means to combine all parts, which is addition.
5. When you see 'take away,' you should subtract.
The phrase 'take away' means to remove from a group, which is subtraction.