Solve problems which require knowing percentage and decimal equivalents of 1/2 , 1/4 , 1/5 , 2/5 , 4/5 and those fractions with a denominator of a multiple of 10 or 25

What this means, in plain words

The denominator is the number underneath the line in a fraction. It tells you how many equal parts the whole was split into.

Two fractions are equivalent when they are worth the same amount even though the numbers look different, such as one half and two quarters.

A multiple of a number is what you get when you multiply it by a whole number, so 12 is a multiple of 3.