Multiplying 6 by an even number less than 10

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If you multiply an even number less than 10 by 6, here is how the answer will look like.

The number in the ones place will be the even number you multiply 6 by.

The number in the tens place will be half the even number.

Example #8

6 × 8 = 48

6 × 6 = 36

You can quickly multiply any number by 9 by following the following two easy steps:

Step 1: Multiply the number by 10.

Step 2: Subtract the number from the answer you got in step 1.

Example #9

Here is how to multiply 18 by 9.

18 × 10 = 180

180 – 18 = 162

Why does it work?

18 × 9 = 18(10 – 1)

18 × 9 = 18 × 10 – 18 × 1

18 × 9 = 180 – 18

Why do we use it?

Because it is easy to multiply any number by 10

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