Easy Multiplication Shortcut 8

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Easy Multiplication Shortcut 8
Multiplying two 2-digit numbers(difference of 2)
Choose a 2-digit number.
Select a number either 2 smaller or 2 larger.
Square the average of the two numbers.
Subtract 1 from this square.

If the first number is 29, choose 31 as the second number.
The average of 29 and 31 is 30. Square 30: 30 × 30 = 900.
Subtract 1: 900 - 1 = 899.
Then 29 × 31 = 899.

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