Easy Multiplication Shortcut 18

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Easy Multiplication Shortcut 18

Multiplying a 2-digit number with 39

1.Select a 2-digit number.
2.Multiply by 4.
3.Add one zero.
4.Subtract the original number.

Ex:1
The 2-digit number chosen to multiply by 39 is 71.
Multiply by 4: 4 × 71 = 284.
Add one zero: 2840.
Subtract the original number:
2840 - 71 = 2800 - 31 = 2769.
So 71 × 39 = 2769.
Ex:2
The 2-digit number chosen to multiply by 39 is 21.
Multiply by 4: 4 × 21 = 84.
Add one zero: 840.
Subtract the original number:
840 - 21 = 819.
So 21 × 39 = 819.

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