Easy Multiplication Shortcut 17

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Easy Multiplication Shortcut 17

Multiplying a 2-digit number by 29
1.Multiply by 3.
2.Add one zero.
3.From this, subtract the original number.
 
Ex:
2-digit number chosen to multiply by 29 is 81.
Multiply by 3: 3 × 81 = 243
Add one zero: 2430
Subtract the original number:
2430 - 81 = 2350 - 1 = 2349
So 81 × 29 = 2349.

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