Is 'of' really the same as multiplying?

Yes, that's the fifth grade insight, from 5.NF.B.4. 2/3 of 18 and 2/3 × 18 are the same computation, and these sheets make that connection routine.

Where does this skill show up later?

Everywhere proportions live: percents, discounts, map scales, probability. Finding a fraction of a number is the template all of those reuse.

5th grade fraction of a number

5th grade fraction of a number worksheets

Fifth grade moves to any fraction of a number: 2/3 of 18, 3/5 of 40. Divide by the bottom, multiply by the top, and the answers still come out whole.

Free printable PDF worksheet, aligned to Common Core 5.NF.B.4.a.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of problems you'll get

Simplify each answer. Write improper fractions as mixed numbers.

2/4 × 12
Answer: 6
2/4 × 4
Answer: 2
2/6 × 15
Answer: 5

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on a 5th grade sheet

The sample sheet above has 10 problems. Its answers run from 2 to 27. On the 4th grade sample they run from 2 to 20. This sheet is aligned to 5.NF.B.4.a. The 4th grade sheet is aligned to 4.NF.B.4.b.

Fraction of a number. Simplify each answer. Write improper fractions as mixed numbers. 10 problems per page.

Every version prints on US Letter or A4, with its answer key after the problems.

How to teach this

Have your child narrate both steps: "18 divided by 3 is 6, times 2 is 12." Writing the one-part value above the fraction keeps the middle step from vanishing. If an answer comes out bigger than the starting number, the steps got swapped. Redo it, division first.

Watch for: Kids divide by the top number instead of the bottom. The denominator says how many equal parts to cut, so divide by it first. Kids stop after the dividing step: 18 ÷ 3 only finds one third, and 2/3 needs that result multiplied by 2.

Common questions about 5th grade fraction of a number

Is 'of' really the same as multiplying?: Yes, that's the fifth grade insight, from 5.NF.B.4. 2/3 of 18 and 2/3 × 18 are the same computation, and these sheets make that connection routine.
Where does this skill show up later?: Everywhere proportions live: percents, discounts, map scales, probability. Finding a fraction of a number is the template all of those reuse.

Related worksheets

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Aligned to Common Core 5.NF.B.4.a. Reviewed by the One more sheet team. Content version 241, updated September 2026.

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