Square 2 Digit Number: UP-DOWN Method

Square a 2 Digit Number, for this example 37:

Finger Math: 9X Rule

To multiply by 9,try this:

(1) Spread your two hands out and place them on a desk or table in front of you.

Square a 2 Digit Number Ending in 5

For this example we will use 25

• Take the "tens" part of the number (the 2 and add 1)=3
• Multiply the original "tens" part of the number by the new number (2x3)
• Take the result (2x3=6) and put 25 behind it. Result the answer 625.

Try a few more :

75 squared ... = 7x8=56 ... put 25 behind it is 5625.

MULTIPLY UPTO 20X20 IN YOUR HEAD

In just FIVE minutes you should learn to quickly multiply up to 20x20 in your head.  With this trick, you will be able to multiply any two numbers from 11 to 19 in your head quickly, without the use of a calculator.