The references refer specific elements in the adult literacy, numeracy, pre-Entry or ESOL curricula for England. Although published in 2001 they are still used to underpin the Functional Maths and Functional English Criteria (2011). For example:
N1 means whole numbers
L1 means Level 1
If you click on any N1/L1.7 hyperlink you will find a list of ALL resources that cover that element. You will also notice that, at the top of the list, it says:
N1/L1.7 Work out simple ratio and direct proportion. (a) understand simple ratio as the number of parts i.e. three parts to one part (b) understand direct proportion as the same rate of increase or decrease, e.g. double, half c) understand the relationship between simple ratio and fractions.
Full details of all the adult curricula can be found on the Excellence Gateway