Eighteen problems a sheet, each asking for a fraction of a whole number - three quarters of 20. The number is built from the fraction rather than picked independently: it is always a multiple of the denominator, so every answer comes out whole and no sheet ends in a remainder a student meeting this for the first time has no method for.
The fraction is always given in lowest terms, which keeps the work to one step in each direction - divide by the denominator, multiply by the numerator - rather than asking a student to simplify and find a fraction of a number at the same time. The multiplier stays between 2 and 8, so the numbers stay inside the times tables even when the denominator is large.
Divide the number by the denominator, then multiply by the numerator. For three quarters of 20: 20 divided by 4 is 5, and 5 times 3 is 15.
Yes. The number on each problem is generated as a multiple of the denominator, so the division is exact every time.
Fractions are drawn already in lowest terms, so simplifying is not folded into a question about something else. The Simplifying Fractions page practises that skill on its own.
It is the same arithmetic - “of” means multiply - written the way it is usually met first, with a whole number rather than a second fraction. Multiplying Fractions has that version.