Question

What is `43 * 5`?

Answer 1

`215`

Explanation:

To multiply by `5` you may find it easiest to multiply by `10` - i.e. add a zero - and divide by `2`.

Otherwise, note that `4*5 = 20` and `3*5 = 15`, so:

`43*5 = (40+3)*5 = (40*5)+(3*5) = 200+15 = 215`