Free Year 3 Add and subtract within 20 Practice | Skillo
Skillo provides free Year 3 NAPLAN Add and subtract within 20 practice (AC9M1N04) for Australian students. No signup, no email, no credit card. Practice questions aligned with the ACARA Australian Curriculum v9.0 strand. Open and start in 10 seconds.
Year 3 students sitting their first NAPLAN need to be confident with add and subtract within 20. Add and subtract numbers within 20 using part-part-whole knowledge and calculation strategies. Skillo has targeted practice questions for this exact skill, mapped to the Australian Curriculum v9.0, free and ready to go.
No account needed. No email. No credit card.
What does the Year 3 NAPLAN Add and subtract within 20 test cover?
- Add and subtract numbers within 20 using part-part-whole knowledge and calculation strategies.
- Questions may include word problems set in real Australian contexts
- Both calculator and non-calculator question types are covered
Try a sample Add and subtract within 20 question
Question 1 — Easy
Zac has 6 apples and Tom has 8 apples. How many apples do they have in total?
Answer: 6 plus 8 equals 14. Adding 6 and 8 gives a total of 14. 12 results from adding 6 and 6 instead of 6 and 8, 2 comes from subtracting instead of adding, and 15 is one more than the correct answer.
Question 2 — Medium
Mia has 15 stickers. She gives 8 stickers to her friend. How many stickers does Mia have left?
Answer: 15 take away 8 equals 7. Counting back 8 from 15 lands on 7. 6 is one too few, 23 comes from adding instead of subtracting, and 8 is just the number being taken away rather than the answer.
Question 3 — Hard
There are 9 kookaburras sitting in a tree. Then 5 more kookaburras land in the tree. What is the total number of kookaburras now?
Answer: 9 plus 5 equals 14. Adding 5 to 9 by counting on gives 10, 11, 12, 13, 14. 4 comes from subtracting instead of adding, 13 is one too few, and 15 is one too many.
How should my child prepare for Year 3 NAPLAN Add and subtract within 20?
- Select Year 3 and Numeracy on the home screen
- Use Quick Practice — questions on add and subtract within 20 will appear as part of the session
- Check the Skill Breakdown on your profile to track your accuracy on add and subtract within 20 specifically
- Review explanations after each question to understand the reasoning behind correct answers
Skillo is free, requires no email or account details, and is built specifically for Australian students. Every question is mapped to the Australian Curriculum v9.0 and filtered by skill so your child practises exactly what they need.
Common questions about NAPLAN Add and subtract within 20
Read more about how Skillo protects student privacy →
Is Skillo really free?
Yes. Skillo is completely free for all Australian students — no subscription, no credit card, no hidden paywall. No free trial that converts to paid.
Does my child need an account?
No. Skillo doesn't require an account to practise. Open any page and start immediately — no email, no registration.
Does Skillo collect any personal information?
No. Skillo is built to require zero personal information. No name, no email, no date of birth is collected from students.
Is Skillo affiliated with NAPLAN?
Skillo's NAPLAN-style practice is authored independently. NAPLAN® is a registered trademark of ACARA. Skillo is not affiliated with, endorsed by, or sponsored by ACARA.
No account needed. No email. No credit card.
About this practice
Skillo's NAPLAN-style practice is authored independently. NAPLAN® is a registered trademark of ACARA. Skillo is not affiliated with, endorsed by, or sponsored by ACARA.