Easy Multiplication Shortcut 14

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Easy Multiplication Shortcut 14

Multiplying two 2-digit numbers (difference of 10)
Choose a 2-digit number.
Select a number either 10 smaller or 10 larger.
Find the middle number of the two (the average).
Square this middle number (multiply it by itself).
Subtract 25 from this square.

If the first number is 78, you might pick 88 as the second number (10 larger).
The middle number (the average) is 83.
Square this middle number: 83 × 83 = 6889.
Subtract 25 from this square: 6889 - 25 = 6864
Then 78 × 88 = 6864.

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