### Maths Tip and Tricks: Multiply Up to 20X20 In your mind

In a 5 minutes everyone can learn to quickly multiply upto 20x20 in your mind. With this Mathematical trick, you will be able to multiply any two numbers from 11 to 19 in your mind quickly, without the use of a paper or pen and a calculator.

I will assume that you know your multiplication table reasonably well up to 10x10.

Try this this few example:

Step one: Make 15 x 13 for an example.

Step two: Always place the bigger numbe8r of the two on top in your mind.

Step three: Then draw the shape of Africa mentally so it covers the 15 and the 3 from the 13 below. Those covered numbers are all you need.

Step four: First add 15 + 3 = 18

Step five: Add a zero behind it (multiply by 10) to get 180.

Step Six: Multiply the covered lower 3 x the single digit above it the "5" (3x5= 15)

Step seven: Add 180 + 15 = 195.

That was the trick! isn't that easy? Practice this on paper first! Read more...