Easy Multiplication Shortcut 19

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Easy Multiplication Shortcut 19

Multiplying a 2-digit number by 999
1.Select a 2-digit number.
2.Add one zero to the number, subtract 1:
 AAA _ _
3.Subtract the original number from 100:
_ _ _AA

Ex:1
The 2-digit number chosen to multiply by 999 is 75.
Add one zero and subtract 1: 750 - 1 = 749:
7 4 9 _ _
Subtract 75 from 100: 100 - 75 = 25:
A A A 2 5
Then 64 × 999 = 74,925.
Ex:2
The 2-digit number chosen to multiply by 999 is 64.
Add one zero and subtract 1: 640 - 1 = 639:
6 3 9 _ _
Subtract 64 from 100: 100 - 64 = 36:
A A A 3 6
Then 64 × 999 = 63,936.

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