Success Homeschool

Year 1 Mathematics · Adding and subtracting within 20

Name: ______________________

Date: ____________

1. What is 8 + 5?
- ☐ (a) 12
- ☐ (b) 13
- ☐ (c) 14
- ☐ (d) 15
2. What is double 6? (6 + 6)
3. What is 15 − 3?
- ☐ (a) 18
- ☐ (b) 11
- ☐ (c) 12
- ☐ (d) 13
4. What is 7 + 3?
5. Noah has 11 marbles and wins 4 more. How many marbles does he have now?
- ☐ (a) 15
- ☐ (b) 14
- ☐ (c) 7
- ☐ (d) 16
6. There are 16 biscuits on a plate. 7 are eaten. How many biscuits are left?
7. Which fact is in the same fact family as 4 + 9 = 13?
- ☐ (a) 13 + 4 = 17
- ☐ (b) 9 − 4 = 5
- ☐ (c) 4 + 13 = 17
- ☐ (d) 13 − 9 = 4
8. Sam has 17 stickers and Ava has 12 stickers. How many more stickers does Sam have than Ava?

Answer sheet

1. 13 — Start at 8 and count on 5: 9, 10, 11, 12, 13.
2. 12 — 6 + 6 = 12. This is a doubles fact.
3. 12 — Start at 15 and count back 3: 14, 13, 12.
4. 10 — 7 and 3 make 10. Count on from 7: 8, 9, 10.
5. 15 — Start at 11 and count on 4: 12, 13, 14, 15.
6. 9 — 16 − 7 = 9. Count back 7 from 16: 15, 14, 13, 12, 11, 10, 9.
7. 13 − 9 = 4 — The fact family uses 4, 9 and 13: 4 + 9 = 13, 9 + 4 = 13, 13 − 9 = 4 and 13 − 4 = 9.
8. 5 — Count on from 12 to 17: 13, 14, 15, 16, 17. That is 5 more.