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If 12 + 8 = 20 then 20 - 12 = 8!

Year 2 Calculation - Addition and Subtraction Facts to 20

Master quick facts to 20. Use number bonds, doubles, and reverses to add and subtract with confidence, ready for word problems and speedy mental maths.

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Fascinating Fact:

Zero keeps totals steady. 13 + 0 = 13 and 13 − 0 = 13. Adding or taking nothing changes nothing.

In KS1 Maths, Year 2 pupils learn number bonds within 0–20, doubles and near doubles, and linked fact families. These patterns make mental addition and subtraction faster and help check answers.

Key Terms

Number bond: Two numbers that make a target total, like 7 + 13 = 20.
Double: Adding a number to itself, for example double 8 is 16.
Fact family: Linked facts using the same numbers, e.g. 9 + 11 = 20, 11 + 9 = 20, 20 − 9 = 11, 20 − 11 = 9.

Warm up with quick facts to 20: try the Addition Game before you start the quiz.

Frequently Asked Questions (Click to see answers)

What are number bonds to 20?

Number bonds to 20 are pairs that add to 20, such as 8 + 12, 5 + 15, and 9 + 11. Knowing them speeds up mental addition and subtraction.

How do doubles help me add to 20?

Doubles give quick anchors. If double 7 is 14, then 7 + 8 = 15. Using doubles and near doubles reduces counting steps.

What is a fact family within 20?

A fact family links two addition facts and two subtraction facts with the same numbers, for example 6 + 14 = 20, 14 + 6 = 20, 20 − 6 = 14, 20 − 14 = 6.

Try These Related Quizzes

Question 1

Which three pairs of numbers all add up to 20?

19 + 1
17 + 3
5 + 15

12 + 9
11 + 7
3 + 16

7 + 20
6 + 12
7 + 19

4 + 12
16 + 8
20 + 1

All the others add up to different numbers

Question 2

Which of the following pairs of number do not add up to give 20?

9 + 11

2 + 18

16 + 5

20 + 0

16 + 5 = 21

Question 3

Which number fact is incorrect?

11 + 9 = 20

9 + 11 = 20

20 - 9 = 11

11 - 20 = 9

11 - 20 gives a negative answer of -9!

Question 4

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

For the subtraction facts, the largest number should be at the beginning

Question 5

Which of the following is true?

12 - 20 = 8

20 - 2 = 18

8 + 20 = 12

18 + 20 = 2

20 - 18 = 2 is the other subtraction fact for these numbers

Question 6

If you know that 14 + 6 = 20, what else do you know?

20 + 14 = 6

20 - 14 = 6

14 - 20 = 6

6 - 14 = 20

You would also know that 20 - 6 = 14

Question 7

Which number is missing: 17 + ? = 20

17 + 3 = 20 and so 3 + 17 = 20 also

Question 8

Which of the following is true?

2 + 18 = 20 so 20 + 18 = 2

2 + 18 = 20 so 18 + 2 = 20

2 + 18 = 20 so 20 + 2 = 18

2 + 18 = 20 so 18 + 20 = 2

Adding the two smaller numbers in any order gives the larger number

Question 9

Which 'family' of facts is incorrect?

7 + 13 = 20
13 + 7 = 20
20 - 13 = 7
20 - 7 = 13

8 + 12 = 20
12 + 8 = 20
20 - 8 = 12
20 - 12 = 8

9 + 11 = 20
11 + 9 = 20
20 - 11 = 9
20 - 9 = 11

4 + 14 = 20
14 + 4 = 20
20 - 4 = 14
20 - 14 = 4

14 + 4 = 18, so all the other facts must be incorrect too

Question 10

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

10 + 10 = 20
20 - 10 = 10

16 + 5 = 21, not 20 so all the other facts must be incorrect too

You can find more about this topic by visiting BBC Bitesize - Fact families - addition facts

Author: Angela Smith (Primary School Teacher & KS1 Quiz Writer)

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