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What is the LCM of 30 and 21 by writing the prime factorization?
Wiki User
∙ 12y ago
start with 30:
(30) = 2 * (15)
(15) = 3 * 5
so, 2 * 3 * 5 = 2^1, 3^1, 5^1
now 21:
(21) = 3 * 7
so, 3 * 7 = 3^1, 7^1
take highest of each factor out of both rows = 2^1, 3^1, 5^1, 7^1
then multiply: 2 * 3 * 5 * 7 = 210
Wiki User
∙ 12y ago
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How do you find the prime factorization of 18 and 21?
Draw the prime factorization table and put both the numbers on it. Find common prime factors and divide both of them writing the products down. Do this until the quotients are either 1 or any prime number. Write down all the factors used and it will be the prime factorization. Multiply them and you will find the LCM of the numbers. Here, 18,21 6,7...................(/3) Prime factorization=6*7*3 LCM=42*3=126
Lcm of 15 and 21 using prime factorization?
It is 105 bacause 3*5*7 = 105
What is the prime factorization for 21?
The prime factorization for 21 is: 3x73 x 7 = 21
What is the prime factorization of 9 and 21 in Lcm?
3 x 3 = 9 3 x 7 = 21 3 x 3 x 7 = 63, the LCM
What is the LCM 9 21 using prime factorization?
3 x 3 = 9 3 x 7 = 21 3 x 3 x 7 = 63, the LCM
What is the LCM of 9 and 21 using prime factorization?
3 x 3 = 9 3 x 7 = 21 3 x 3 x 7 = 63, the LCM
What is the LCM of 14 and 21 using prime factorization?
2 x 7 = 14 3 x 7 = 21 2 x 3 x 7 = 42, the LCM
What is the LCM of 15 and 21 using prime factorization?
3 x 5 = 15 3 x 7 = 21 3 x 5 x 7 = 105, the LCM
How do you do prime factorization with the number 21?
3 x 7 = 21, since both factors are prime, that is the prime factorization of 21.
How can you use prime factorization to find the LCM of 15 and 21?
3 x 5 = 15 3 x 7 = 21 3 x 5 x 7 = 105, the LCM
What is the prime factorization of 71421 use the prime factors what is the LCM and GCF of each number?
The prime factorization of 71421 is 3 x 7 x 19 x 179 but that's probably not what we're dealing with here. 7 2 x 7 = 14 3 x 7 = 21 The LCM and GCF refer to the set as a whole, not the individual numbers. The GCF of 7, 14, 21 is 7 The LCM of 7, 14, 21 is 42
What is the prime factorization of number 21?
The prime factorization of 21 is 3 x 7.
