Easy Multiplication Shortcut 4

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Easy Multiplication Shortcut 4

Multiplying two 2-digit numbers (difference of 2)
1:Choose a 2-digit number.
2:Select a number either 2 smaller or 2 larger.
3:Square the Middle number.
4:Subtract 1 from this square.

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

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