A Quick Multiplication

If i asked You To solve 87×83 in 2second.

Can you do it??

If yes,Great

If no then alright i will teach you.

Let Me explain!

This Trick has Some merits and some demerits.

NOTE:

1.This Trick Only works for 2×2 Multiplication 

2.The addition of the right of the two numbers should be 10.

3.The left digit of the two number should be same.

How about the square of 85?Since8÷9=72, we immediately get 85×85= 7225.

We can use a similar trick when multiplying two-digit numbers with the same first digit, and second digits that sum to 10.

The answer begins the same way that it did before (the first digit multiplied by the next higher digit), followed by the prod-

uct of the second digits. For example, let’s try 83×87. (Both

numbers begin with 8, and the last digits sum to 3+7 =10.)

Since 8×9=72, and 3×7 =21, the answer is 7221.

😊 Now Its your Turn

Do it as described above

1.57×53=?

2.46×44=?

3.91×99=?