The Singing Hedgehog Guide
This is also known as
Egyptian or Peasant Multiplication and is very easy to use.
- first, write the
two numbers next to each other.
- next, double the first and halve the second, ignoring any fractions.
- keep doing that until the right hand column becomes 1.
- then, cross out any row with an even number in the right hand column.
- finally, add up the left hand column and that's the answer!
Here is an example with 27 x 14:
27 14 even on the right, so cross them out
108 3 ignore the half