Here are several different number tricks that will always equal 9. Every trick is explained with one or two examples and detailed instructions.
This is the basic principle of these number tricks:
You take any number and after several calculations, the end result will always be 9. For most of these tricks, creating the sum of the digits is the reason why they work.
You can find some more math tricks using only numbers between 1 – 10 right here.
Right here, I’ve listed several number tricks that always equal 9. You will always find the source of the trick at the bottom of the explanation.
The easiest number trick that always equals 9
This is the easiest trick I could find. You only need a few simple calculations that can be done without a calculator.
To make this trick work, you can only use a number between 1 and 9, that’s why calculations are so easy. If you are looking for a trick using larger numbers, you will find them at the bottom of this post.
This is how you do the trick:
| How to do the trick | Example |
|---|---|
| Think of any number between 1 and 9 | Example: 7 |
| Multiply your number with 3 | 7 x 3 = 21 |
| Add 3 to your number | 21 + 3 = 24 |
| Multiply your number with 3 again | 24 x 3 = 72 |
| Add the digits together, the result will always be 9 | 7 + 2 = 9 |
This trick is really easy and perfect for children because the numbers are all really small. Here’s another example, using the number 8:
- Think of any number between 1 and 9: 8
- Multiply your number with 3: 8 x 3 = 24
- Add 3 to your number: 24 + 3 = 27
- Multiply your number with 3 again: 27 x 3 = 81
- Add the digits together, the result will always be 9: 8 + 1 = 9
This video explains the trick:
Another easy “Number 9 trick”
This is another easy way to do this number or math trick. All the calculations are very simple and can be done without a calculator, so you perform this trick everywhere without any preparation.
Here’s how you do it:
| How to do the trick | Example |
|---|---|
| Think of any two-digit number | Example: 93 |
| Reverse the digits to get your second number | 39 |
| Subtract the smaller number from the larger one | 93 – 39 = 54 |
| Your answer will always be a product of 9 | 54 = 6 x 9 |
| The sum of the digits will always be 9 as well | 5 + 4 = 9 |
This trick works for any number, as long as it has two digits! So don’t use any number above 100, it will get a little harder to calculate. But it’s still possible, as I will explain in the next section.
This is another example, using the number 62.
- Think of any two-digit number: 62
- Reverse the digits to get your second number: 26
- Subtract the smaller number from the larger one: 62 – 26 = 36
- Your answer will always be a product of 9: 36 = 4 x 9
- The sum of the digits will always be 9 as well: 3 + 6 = 9
For this trick, you can use as many digits as you want – they result will always be 9
This is basically the same trick, but it works with larger numbers as well. All you have to do: calculate the sum of the digits one more time.
You will need a calculator for this one.
Here’s how you do it:
| How to do the trick | Example |
|---|---|
| Think of any number, with as many digits as you want | Example: 7263 |
| Create another number with the same four digits by changing their order | 2637 |
| Subtract the smaller number from the larger one | 7263 – 2637 = 4626 |
| Take the result, and calculate the sum of the digits | 4 + 6 + 2 + 6 = 18 |
| If necessary, calculate the sum of the digits again – the number will always be 9 | 1 + 8 = 9 |
This video explains the trick in detail, showing two different examples:
Have fun with it!
One more number trick where the result will always be 9
This is another trick, using a similar principle as the previous one. However, this one is slightly different.
It’s based on creating the sum of the digits several times.
| How to do the trick | Example |
|---|---|
| Think of any number, using as many digits as you want (it has to be larger than 10) | Example: 89512 |
| Calculate the sum of the digits | 8 + 9 + 5 + 1 + 2 = 25 |
| Subtract the result of the original number | 89512 – 25 = 89487 |
| Add the digits together | 8 + 9 + 4 + 8 + 7 = 36 |
| If necessary, calculate the sum of the digits one more time – the result will always be 9 | 3 + 6 = 9 |
This number trick is slightly easier than the previous ones because it skips one step, but it uses the same system.
Are you looking for even more math tricks?
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