Numbers index

  10001001   Multiplying in Binary   10010001  

Binary Numbers --- Introduction --- Addition --- Multiplication --- Counter --- Card game

Binary multiplication doesn't involve any multiplication tables at all. All you need are 0x0=0, 1x0=0, 0x1=0, 1x1=1. For long multiplication, you do need to add. It works like decimal multiplication. You separate one number into its powers of two (if it was a decimal number, this would be separating the number into its hundreds, tens and units, etc., so 3426 = 3000 + 400 + 20 + 6). Then you multiply the other number by each digit. You need the add the right number of '0's on the end, of course. Try out the multiplier below to see how it works. Enter two decimal numbers from 1-63 and click on 'Multiply'.
First number (in decimal):
Second number (in decimal):