Easy Multiplication Shortcut 13

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Easy Multiplication Shortcut 13

Multiplying two 2-digit numbers (difference of 8)
Choose a 2-digit number.
Select a number either 8 smaller or 8 larger.
Find the middle number of the two (the average).
Square this middle number (multiply it by itself).
Subtract 16 from this square.

If the first number is 64, choose 72 as the second number (8 larger).
The middle number i.e average is 68.
Square this middle number: 68 × 68 = 4624.
Subtract 16 from this square: 4624 - 16 = 4608.
Then 64 × 72 = 4608.

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