Easy Multiplication Shortcut 24

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Easy Multiplication Shortcut 24

Multiplying two 2-digit numbers (difference of 10)
1.Choose a 2-digit number.
2.Select a number either 10 smaller or 10 larger.
3.Find the middle number of the two (average).
4.Square this middle number (multiply itself).
5.Subtract 25 from this square.
 
Ex:1
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.
Ex:2
If the first number is 36, choose 26 as the second number (10 smaller).
The middle number (the average) is 31.
Square this middle number: 31 × 31 = 961.
Subtract 25 from this square: 961 - 25 = 936
Then 36 × 26 = 936.

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