Tricks for Multiplying by 9 Video
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# Video:Tricks for Multiplying by 9

with Zoya Popova

Multiplying by 9 is easy with these helpful tricks. Learn three ways to learn how to solve multiples of 9.See Transcript

## Transcript:Tricks for Multiplying by 9

Hi, I'm Zoya Popova for About.com, and today I'm going to tell you about tricks for multiplying by 9. Learning the multiplication table can be hard, so having shortcuts is very helpful.

### Multiply by 9 with the Subtraction Trick

When we multiply 9 by any single-digit number, our product will consist of two digits. The first digit will be that number minus 1. For 5x9, the first digit of the product will be 5-1=4. The second digit of the product will be 9 minus the first digit. So, for 5x9, the second digit will be 9-4=5. 5x9=45.

For 9x9, the first digit will be 9-1=8; and the second digit will be 9-8=1:9x9=81. For 3x9, the first digit will be 3-1=2; the second digit will be 9-2=7:3x9=27.

### Multiply by 9 with the Hands Trick

Another method that works for multiplying by 9 is very “hands on”. It uses your own fingers. Imagine your fingers are numbers from 1 to 10. To multiply any number by 9, hold down the finger that represents that number.

For instance, to multiply 2 by 9, hold down your second finger. Now, count the fingers before and after it. We have 1 finger before our second finger and 8 left after it. So the answer will be 18. Let's say we're multiplying 5x9. Hold down your fifth finger. Now, we have 4 fingers before it and 5 fingers after it. The result is 45.

### Multiply by 9 with the 0 Trick

And a final shortcut for multiplying by 9 goes like this. To multiply any number by 9, write a zero after that number and then subtract that number from the result. 6x9 is 60-6=54. In the same fashion, 4x9 will be 40-4=36.And those are the tricks for multiplying by 9.