Factors, Multiples, Prime and Composite Numbers
Print 4th grade worksheets finding factor pairs within 100, listing multiples, and classifying prime vs composite numbers, with clean printable answer keys. Aligned with Common Core standard CCSS 4.OA.B.4.
Worksheet version 1 of 12. Generates reproducible factor and multiple practice problems with an exact matching answer key.
1. Find all factor pairs for the number 24.
1 × ____, 2 × ____, 3 × ____, 4 × ____
Target Number
2. List the first 5 multiples of 6.
____, ____, ____, ____, ____
3. Classify each number as Prime or Composite: 13, 21, 29, 35.
13: ________ | 21: ________ | 29: ________ | 35: ________
4. Is 7 a factor of 56? Explain why or why not.
Yes / No because: ____________________________________
5. Find a number between 20 and 30 that is a common multiple of both 3 and 4.
Common multiple: ________
6. List all factors of 36 in order from least to greatest.
Factors of 36: ____________________________________
Key Vocabulary & Rules
In 4th grade operations and algebraic thinking (CCSS 4.OA.B.4):
- Factor: A whole number that multiplies with another whole number to make a product (e.g. 3 and 4 are factors of 12).
- Multiple: The product of a given number and any whole number (e.g. multiples of 5 are 5, 10, 15, 20...).
- Prime Number: A whole number greater than 1 that has exactly two factors: 1 and itself (e.g. 2, 3, 5, 7, 11, 13, 17, 19, 23...).
- Composite Number: A whole number greater than 1 with more than two factors (e.g. 4, 6, 8, 9, 10, 12...).
- Note: The number 1 is neither prime nor composite. The number 2 is the only even prime number!
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