Factors & Multiples (Classical)
Free 4th grade factors & multiples (classical) worksheets. Grade 4 — Week 2 of 9. Prime and composite numbers from the Latin primus (first). Children learn the formal definitions, classify numbers by counting factors, and use the Sieve of Eratosthenes to find every prime to 100.
What's Included
- 5 practice worksheets
- Full answer keys
- Common Core aligned (4.OA.B.4)
- Print-ready PDF format
All Weeks
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
Factors & Multiples (Classical)
About Factors & Multiples (Classical)
Week 2 introduces the distinction between prime and composite numbers through formal definition. The ancient Greeks called primes protos arithmos — the first numbers — because they cannot be built from smaller whole-number factors. Five worksheets carry your child through definition recall, the Sieve of Eratosthenes for finding every prime to 100, and the careful classification of 1 as neither prime nor composite. By week’s end, your child will name primes on sight and reason about why composite numbers can always be broken down.