Multiplying by a power of 2

To multiply a number by 2, 4, 8, 16, 32, or some other power of 2 just keep doubling the product as many times as necessary.

If you want to multiply by 16 then double the number 4 times since 16 = 2x2x2x2.

15x16: 15x2 = 30. 30x2 = 60. 60x2 = 120. 120x2 = 240.

23x8: 23x2 = 46. 46x2 = 92. 92x2 = 184.

54x8: 54x2 = 108. 108x2 = 216. 216x2 = 432.

Posted in: Maths, Multiplication