1 2 3 4 5 6 7 8 9
We all know how to count to 9 using the numbers 1-9.
Can you count to 9, only using the number 2?
Of course we can, we just need a bit of math to help us out.
Let's start with 1
If you have 2 apples, and need to share them between yourself and a friend - how many apples do you get each?
2 apples shared between 2 friends = 1
Yes - 2/2 = 1
A more difficult one: How to get to 4
Square is when you multiply a number as many times as the square (the little number in a raised position after the main number).
This means 2 multiplied by itself 2 times (2 x 2) = 4.
Combining + and – and x and ÷ and square
Fortunately, there are some simple rules in mathematics helping us to figure out how to solve this one.
The rules are:
- First you do the squares. So 2x2 = 4
- Next, you do x and ÷ (mutiply and divsion) , so we do 4 x 2 = 8 AND we do 2/2 = 1
- As the last thing we do + and – (plus and minus), so here the 8 from above + 1 (the 2/2) = 9
The rule is Squares before x and ÷ before + and – .
Counting 1 to 9
Here is finally how we can use only 2s to count from 1 to 9: