What is 9 × 9?
9 × 9 = 81
Nine times nine is 81: 9 groups of 9, or 9 groups of 9. 81 has the digits of 18 (2 × 9) the other way round, and 72 (8 × 9) is close by.
A way to remember it
Ten 9s take away one 9: 90 − 9 = 81. A square number: 9 rows of 9.
See it
9 rows of 9 dots. Count them in 9s and you reach 81.
Ways to work it out
9 groups of 9: ten groups, take one away
- 10 × 9 = 90.
- Take away one 9: 90 − 9 = 81.
The fact family
Know one and you know both. Division undoes multiplication.
- 9 × 9 = 81
- 81 ÷ 9 = 9
Don't mix it up with
- 8 × 9 = 728 × 9 is one group of 9 fewer: 81 − 9 = 72.
- 2 × 9 = 182 × 9 = 18 has the same digits in the other order. Nine 9s is far more than two 9s.
Quick check
4 questions: 9 × 9, the facts it gets mixed up with, and a division fact from its family. A tricky one comes back until you've got it.
Frequently asked questions
What is 9 times 9?
9 × 9 = 81. It is a square number.
What is 81 divided by 9?
81 ÷ 9 = 9, because 9 × 9 = 81.
More tricky facts
See every fact on the multiplication chart, or learn the strategies that work for any fact.