Which number is a factor of 21?
Understand the Problem
The question is asking which number can be divided evenly into 21 without leaving a remainder. To solve it, we would look for numbers that can multiply together to give 21.
Answer
1, 3, 7, and 21
The numbers 1, 3, 7, and 21 are factors of 21.
Answer for screen readers
The numbers 1, 3, 7, and 21 are factors of 21.
More Information
Factors of a number are the integers that can be multiplied together to get that number. For 21, these are 1, 3, 7, and 21.
Tips
A common mistake is to overlook smaller factors or to miss testing divisibility by all relevant primes.
Sources
- Factors of 21 - Finding the Prime Factors by Division Method - BYJU'S - byjus.com
- Find Prime Factorization/Factors of 21 - Cuemath - cuemath.com
- What are the Factors of 21? - Thinkster Math - hellothinkster.com
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