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Prime and composite: up to 20
Free printable Grade 4 math worksheet for "Prime and composite: up to 20" — practice factors and multiples. No-prep, print or assign online.
This worksheet helps students practice identifying prime and composite numbers up to 20, reinforcing their understanding of factors and multiples. Teachers can use it to assess students' ability to classify numbers and deepen their number sense in a hands-on way. Ideal for Grade 4 math lessons focused on factors, multiples, and number properties.
Learning objectives
- Identify prime and composite numbers up to 20.
- Classify numbers as prime or composite based on their factors.
- Explain the difference between prime and composite numbers using examples.
How to use this worksheet
- Click “Download Worksheet” and sign in with Google or email to get the PDF instantly.
- Print at home or in class for Grade 4; it's no-prep, with no extra materials needed.
- Hand it out as classwork, homework, or a quick warm-up.
Frequently asked questions
Is the “Prime and composite: up to 20” worksheet free?
Yes. “Prime and composite: up to 20” is a free printable Math worksheet. Sign in with Google or email to download the PDF instantly.
What grade or age is this Math worksheet for?
It's designed for Grade 4 (ages 9–10), covering Factors and multiples.
Do I need to prep anything?
No. It's a no-prep, print-and-go worksheet — just download and hand it out.
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