Multiplying Whole Numbers Close to Each Other

These multiplication tricks will only work for you if you have memorized or can quickly calculate the square of numbers. Learn the trick of finding square of any two digit number.  Also master the shortcut to find the square of any number.

Multiplication of Two Numbers that Differ by 2

When two numbers differ by 2, their product is always the square of the number in between these numbers minus 1.

Example
1. 18*20 = 19^2 – 1 = 361 – 1 = 360
2. 25*27 = 26^2 – 1 = 676 – 1 = 675
3. 49*51 = 50^2 – 1 = 2500 – 1 = 2499

Multiplication of Two Numbers that Differ by 4

If two numbers differ by 4, then their product is the square of the number in the middle (the average of the two numbers) minus 4.

Example
1. 22*26 = 24^2 – 4 = 572
2. 98*102 = 100^2 – 4 = 9996

3. 148*152 = 150^2 – 4 = 22496

 

Multiplication of Two Numbers that Differ by 6

If the two numbers differ by 6 then their product is the square of their average minus 9.

Example

1. 10*16 = 13^2 – 9 = 160
2. 22*28 = 25^2 – 9 = 616

3. 997*1003 = 1000^2 – 9 = 999991

 

Now come with numbers with any of the conditions mentioned above and try solving them using these multiplication tricks. By practice you will be able to master these multiplication shortcuts.

Let me know if the above trick helped you in any way. Waiting for your feedback.

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