GCF (HCF) of 8 and 21
"Greatest Common Factor" Calculator
What is the Greatest Common Divisor of 8 and 21?
Answer
GCF (HCF) of 8 and 21 is
1
Common factors: 1
Only 1 divides both: 8 and 21 share no prime factor.
Such numbers are called coprime (relatively prime); their LCM is just the product: 8 × 21 = 168.
8 = 23
21 = 3 × 7
| Prime | 8 | 21 | Lowest power |
|---|---|---|---|
| 2 | 23 | — | — |
| 3 | — | 3 | — |
| 7 | — | 7 | — |
— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.
GCF = 1
More with these numbers
Found an error in the calculation or the information?
Related Calculations
See Also
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
- Greatest Common Factor of 3 Numbers - Find the Greatest Common Factor (GCF) of three numbers
- Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers
Share This Calculation
Print
<a href="https://calculat.io/en/number/greatest-common-factor-of/8--21">What is the GCF (HCF) of 8 and 21 - Calculatio</a>Facebook
Twitter
Telegram
WhatsApp
Viber
Email
