Recall decimal fraction equivalents for 1/2, 1/4, 1/5 and , 1/10 and for multiples of these proper fractions

What this means, in plain words

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.

A decimal writes parts of a whole using the places after the point: tenths, then hundredths, then thousandths.