Method to find the LCM of two numbers a & b:
1- Find the GCF(Greatest Common Factor) of a & b.
2- Find the product of a & b.
3- Divide the product of a & b by the result obtained in step 1.
STEP 1:
Greatest common factor can be found by the method of prime factorization.
Prime factorization of 121 = 11 x 11
Prime factorization of 132 = 11 x 12
GCF(121, 132) = 11
STEP 2:
Product of 121 & 132 = 15972
STEP 3:
LCM(121, 132) = 15972/11 = 1452
Ignore 7, since it's a factor of 21.
2 x 2 x 3 = 12
3 x 7 = 21
Combine the factors, eliminating duplicates.
2 x 2 x 3 x 7 = 84, the LCM
It is: 3564
The LCM is 84.
LCM of 4 7 12 21 is 84
The LCM is 84.
It is: 21
The LCM is 21.
The LCM is 252.
84This question is asking for the Lowest Common Multiple (LCM) - also called the Least Common Denominator (LCD).Generally, you can find the LCM of 2 of the numbers, then find the LCM of that number with the third.Since 3 and 7 are both prime, their LCM is 3x7=21. To find the LCM of 21 and 12, make a list of their multiples until you find a number common to both lists:12: 12. 24, 36, 48, 60, 72, 84, ...21: 21, 42, 63, 84, ...
The LCM seems to be 756.
the lcm of 3 and 7 is 21 and the lcm of 7 and 21 is 21, so the lcm of 3, 7 and 21 is the lcm of 21 and 21 which is 21.
The LCM is: 84
The LCM of 4, 7, 12, and 21 is 84.
21