Question

What do we need to add to 2 / 1 8 to make 5

Answer 1

`4\frac{8}9}`

Explanation:

We can do this mathematically.

`5-(2)/(18) = (90)/(18) - (2)/(18) = (88)/(18) = (44)/(9) = 4(8)/(9) \\`

We can also work this logically.

We know that
`(2)/(18)` is less than 1, so our answer should be (5-1) and a fraction.

Our answer should be 4 plus a fraction less than 1. To find what we need to add to
`(2)/(18)` to make 1, we ask ourself how many eighteenths make 1. So if we need to 18 parts and we have 2 already, we add 16 eighteens to make 1. The answer is
`4 (16)/(18)`, or simplified,
`4\frac{8}9}`.