Okay so you need to do this using fractions, well that's what I learnt anyway.
So start off with the thing you want to divide on top and the thing you're dividing by on the bottom.
2.4
----
40
(Sorry but that is the only way to show working)
Now you change the decimal into a whole number by multiplying it by 10. If the number was 2.44 then it would times by 100.
24
---
40
Now times 40 by 10 because whatever operation you apply to the top, you need to apply to the bottom.
24
---
400
So now you just do 24 divided by 400 which is.........
0.06
I hope this (long) explanation helped
