Subtraction from 20 Games Online Free
Take a number from 1 to 19 away from 20, like 20 − 7 or 20 − 13. Each fact is a number bond to 20.
Type answers on your keyboard, or tap the number pad.
Practise these again:
How do you subtract from 20?
Think of the pair that makes 20. Since 7 + 13 = 20, 20 − 7 = 13. Every fact in this game is a number bond to 20 turned around.
Another way is to go through 10: 20 − 7 is 10 + (10 − 7), which is 10 + 3 = 13.
How to play Subtraction from 20
- Choose the 60-second challenge or untimed practice, then press Start.
- Type each answer on your keyboard or tap the number pad. It’s checked as soon as you’ve typed enough digits, or press ✓.
- Get one wrong and you’ll see the right answer, and the question comes back a little later.
- At the end, check your score and the facts to practise again.
Subtraction from 20 skills
- Subtracting from 20
- Using number bonds to 20
- Subtracting teen numbers
Level: Grades 1–2 (ages 6–8)
Tips for subtracting from 20
Take away a single-digit number and the answer is a teen: 20 − 6 = 14, because 10 − 6 = 4.
Take away a teen and the answer is a single digit: 20 − 16 = 4.
Check with addition: 14 + 6 = 20.
Subtraction from 20 questions and answers
How is this different from subtraction within 20?
This game always starts from 20. The subtraction within 20 game uses different teen numbers, like 15 − 7.
Why is subtracting from 20 useful?
It builds the same skill as subtracting from 100 or 1,000 later, and it comes up in everyday things like counting down or working out change from $20.
What happens if I get one wrong?
The game shows the fact and the bond behind it, for example 20 − 7 = 13, because 7 + 13 = 20.