Free Year 3 Add and subtract within 20 Practice | Skillo

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.

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What is tested: Add and subtract within 20

  • ✓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

Sample questions

Question 1 — Easy

Mia has 15 stickers. She gives 8 stickers to her friend. How many stickers does Mia have left?

A) 6
B) 23
C) 8
D) 7

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 2 — Medium

There are 9 kookaburras sitting in a tree. Then 5 more kookaburras land in the tree. What is the total number of kookaburras now?

A) 14
B) 4
C) 13
D) 15

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.

Question 3 — Hard

What is 9 plus 6?

A) 13
B) 14
C) 15
D) 16

Answer: 9 plus 6 equals 15. A student can count on 6 from 9 to reach 15. 13, 14, and 16 are all incorrect because they result from miscounting by one or two steps.

How to use Skillo for Year 3 Numeracy

  1. Select Year 3 and Numeracy on the home screen
  2. Use Quick Practice — questions on add and subtract within 20 will appear as part of the session
  3. Check the Skill Breakdown on your profile to track your accuracy on add and subtract within 20 specifically
  4. 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.

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No account needed. No email. No credit card.