Addition and Subtraction Facts to 20
If 12 + 8 = 20 then 20 - 12 = 8!

Addition and Subtraction Facts to 20

This Math quiz is called 'Addition and Subtraction Facts to 20' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is a fun way to learn if you are in the 1st or 2nd grade - aged 6 to 8.

It costs only $12.50 per month to play this quiz and over 3,500 others that help you with your school work. You can subscribe on the page at Join Us

Knowing addition and subtraction facts (or number facts) to 20 by heart means being able to quickly know the pairs of numbers which make a total of twenty, as well as the associated subtraction facts. For example, if you know that 13 + 7 = 20, then you should also recognize that 20 - 13 = 7 or 20 - 7 = 13.

How well do you know the number facts to 20?

1.
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!
2.
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
3.
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
4.
Which number is missing: 17 + ? = 20
5
3
7
9
17 + 3 = 20 and so 3 + 17 = 20 also
5.
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
6.
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
7.
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
8.
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
9.
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
10.
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
Author:  Angela Smith

© Copyright 2016-2019 - Education Quizzes
TJS - Web Design Lincolnshire
View Printout in HTML

Valid HTML5

We use cookies to make your experience of our website better.

To comply with the new e-Privacy directive, we need to ask for your consent - I agree - No thanks - Find out more