Which 'family' of facts is incorrect?

2 + 18 = 20 18 + 2 = 20 20 - 18 = 2 20 - 2 = 18

16 + 5 = 20 5 + 16 = 20 20 - 16 = 5 20 - 5 = 16

5 + 15 = 20 15 + 5 = 20 20 - 5 = 15 20 - 15 = 5

Which three other facts go with 16 + 4 = 20?

20 + 16 = 4 20 + 4 = 16 16 - 20 = 4

16 - 20 = 4 4 - 20 = 16 20 + 16 = 4

4 + 16 = 20 16 - 4 = 20 4 - 16 = 20

4 + 16 = 20 20 - 16 = 4 20 - 4 = 16

KS1Maths★★ Medium

Year 2 Calculation - Addition and Subtraction Facts - Set 20

Learning number facts not only familiarises children with numbers and how they work, it also gives them the knowledge that as 17 and 3 is a number fact of 20,…

Written by Dr. Emma ClarkeReviewed by Daniel FosterUpdated 14 Apr 2026

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Quiz details

Topic: 20

Questions: 8

Duration: 10 min

Difficulty: ★★ Medium

Focus: building a clean 20 method and avoiding arithmetic slips.

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Description

Learning number facts not only familiarises children with numbers and how they work, it also gives them the knowledge that as 17 and 3 is a number fact of 20, then 20 minus 3 must be 17. This KS1 Maths and Numeracy quiz is for year 2 children and will help with addition and subtraction calculations.

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Quiz FAQ

How should I use this Year 2 Calculation - Addition and Subtraction Facts - Set 20?

Complete the quiz once under normal timing, review every mistake, then return to the Maths subject page to try a related quiz while the topic is still fresh.

What should I do after finishing this Year 2 Calculation - Addition and Subtraction Facts - Set 20?

Use your score as a signal. If the result is strong, move to another Maths quiz for wider coverage. If the result is weak, repeat practice in the same subject before switching topics.

Is Year 2 Calculation - Addition and Subtraction Facts - Set 20 enough on its own for Maths revision?

One quiz is useful for diagnosis, but not enough on its own. The strongest approach is to combine this page with other quizzes in Maths, plus broader revision or past-paper style practice where available.