Multiplying By 11

Multiplying a number by 11 may take quite a long time (for beginner) especially when the number is large. Try this trick!

879 X 11 = ?

THINK :

8 + 7 = 15

7 + 9= 16

Put the numbers between 8 and 9.

8 15 16 9

Now, add the numbers' (in between 8 and 9) left digit to the left digit in the original number.

15 + 1 = 16

8 + 1 = 9

The answer is 9669.

Is it accurate? Check it on your calculator!

That's right!

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