What is the GCF of 12 and 21?
- Find the prime factorization of 12. 12 = 2 × 2 × 3.
- Find the prime factorization of 21. 21 = 3 × 7.
- Therefore, GCF = 3.
What is the GCF of 21?
What is the GCF of 21 and 21? The GCF of 21 and 21 is 21.
What is the least common multiple of 12 and 21?
Least common multiple (LCM) of 12 and 21 is 84.
What is the greatest common factor of 12 21 and 30?
As you can see when you list out the factors of each number, 3 is the greatest number that 12, 21, and 30 divides into.
What is the GCF of 12 and 18?
6
Example 1: 6 is the greatest common factor of 12 and 18.
What is the HCF of 16 and 24?
8
The HCF of 16 and 24 is 8. To calculate the Highest common factor (HCF) of 16 and 24, we need to factor each number (factors of 16 = 1, 2, 4, 8, 16; factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24) and choose the highest factor that exactly divides both 16 and 24, i.e., 8.
What is the GCF of 18 and 24?
Correct answer: 18 and 24 share one 2 and one 3 in common. We multiply them to get the GCF, so 2 * 3 = 6 is the GCF of 18 and 24.
What’s the HCF of 12 and 15?
3
As visible, 12 and 15 have only one common prime factor i.e. 3. Hence, the HCF of 12 and 15 is 3.
What is the LCM of 7 and 21?
Answer: LCM of 7 and 21 is 21.
What is the LCM of 15 and 24?
120
Answer: LCM of 15 and 24 is 120.
Which is the greatest common factor of 12 and 21?
Greatest Common Factor of 12 and 21. Greatest common factor (GCF) of 12 and 21 is 3. GCF(12,21) = 3.
How to calculate the least common multiple of 12 and 21?
Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor. Least Common Multiple of 12 and 21 with GCF Formula. The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
Which is the least positive multiple of 21?
The LEAST POSITIVE difference is 3 it appears . Well 12 x 21 = 252 so the smallest possible difference is ZERO. 21 42 63 84 105 126 147 168 This repeats every 4th multiple of 21 (or 7th multiple of 12) The LEAST POSITIVE difference is 3 it appears . The multiples of 12 and of 21 are written in order.
What are the factors for 12, 21, and 30?
For 12, 21, and 30 those factors look like this: 1 Factors for 12: 1, 2, 3, 4, 6, and 12 2 Factors for 21: 1, 3, 7, and 21 3 Factors for 30: 1, 2, 3, 5, 6, 10, 15, and 30
