Rationalise - Turn into fraction
Rations can be shared half each (rations can be fractions).
1.5 is rational because = `3/2`
0.333 is rational because = `1/3`
`pi` is not rational (irrational) because it can’t be turned into a fraction.
`22/7` is bigger than `pi`. It’s close but not accurate.
`sqrt2` is irrational because it can’t be turned into a fraction.