Åk 6–9
7.5 Division of Decimals
If the number contains decimals in both the denominator and the numerator, it can look harder than it actually is.  Here, it is normally just to use extension (see 7.2).You can use your calculator to do division.  If you don’t need an exact answer, then an approximation should be enough.

Example: 7.5 ÷ 0.3

Here it seems reasonable to extend by 10 – in other words multiply both the numerator and denominator by 10.  It then becomes easier to calculate in your head.

7.5 ÷ 0.3 = = 75 ÷ 3 = 25

A good way of remembering this is to always try to multiply with something so that there is a whole number in the denominator and numerator.