GCF for 21 and 61
"Greatest Common Factor" Calculator
What is the Greatest common Divisor of 21 and 61?
Answer: GCF of 21 and 61 is 1
(One)
Finding GCF for 21 and 61 using all factors (divisors) listing
The first method to find GCF for numbers 21 and 61 is to list all factors for both numbers and pick the highest common one:
All factors of 21: 1, 3, 7, 21
All factors of 61: 1, 61
So the Greatest Common Factor for 21 and 61 is 1
Finding GCF for 21 and 61 by Prime Factorization
Related Calculations
See Also
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
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GCF Table
| Number 1 | Number 2 | GCF |
|---|---|---|
| 6 | 61 | 1 |
| 7 | 61 | 1 |
| 8 | 61 | 1 |
| 9 | 61 | 1 |
| 10 | 61 | 1 |
| 11 | 61 | 1 |
| 12 | 61 | 1 |
| 13 | 61 | 1 |
| 14 | 61 | 1 |
| 15 | 61 | 1 |
| 16 | 61 | 1 |
| 17 | 61 | 1 |
| 18 | 61 | 1 |
| 19 | 61 | 1 |
| 20 | 61 | 1 |
| 21 | 61 | 1 |
| 22 | 61 | 1 |
| 23 | 61 | 1 |
| 24 | 61 | 1 |
| 25 | 61 | 1 |
| 26 | 61 | 1 |
| 27 | 61 | 1 |
| 28 | 61 | 1 |
| 29 | 61 | 1 |
| 30 | 61 | 1 |
| 31 | 61 | 1 |
| 32 | 61 | 1 |
| 33 | 61 | 1 |
| 34 | 61 | 1 |
| 35 | 61 | 1 |
About "Greatest Common Factor" Calculator
This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest common Divisor of 21 and 61? (The answer is: 1). Select the first number (e.g. '21') and the second number (e.g. '61'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder