Practice Composite Numbers in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
Integers greater than 1 that can be expressed as a product of two smaller positive integers; they are the opposite of primes.
Numbers that can be built by multiplying smaller numbers together.
Example 1
easyDetermine whether 91 is prime or composite. If composite, find a factor pair.
Example 2
mediumList all composite numbers between 20 and 35, and for each, give one non-trivial factor pair.
Example 3
easyIs 1 composite? Is 4 composite? Is 2 composite? Explain each briefly.
Example 4
mediumHow many composite numbers are there from 1 to 20? List them and explain why each is composite.