How do we define LCM?

LCM, abbreviation for least common multiple, is defined as the smallest number that is the product of two or more numbers 7 and 20

Properties of LCM

  • The LCM of two given numbers is never less than any of those numbers. Eg- LCM of 7 and 20 is 140, where 7 and 20 are less than 140.
  • LCM is commutative which means LCM(a, b, c) = LCM(LCM(a, b), c) = LCM(a, LCM(b, c)).
  • The LCM of two or more prime numbers is exactly equal to their product.
  • LCM is associative which means LCM(7, 20) = LCM(20, 7).
  • LCM is distributive, which means LCM(ab, bc, ad) = d * LCM(x, y, z).

Steps to find lcm of 7 and 20 by Listing Method

Example: Find lcm of 7 and 20 by Listing Method

  • Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140
  • Multiples of 20: 20, 40, 60, 80, 100, 120, 140

Hence, LCM of 7 and 20 is 140.

Steps to find LCM of 7 and 20 by Common Division Method

Example: Find lcm of 7 and 20 by Common Division Method

2 7 20
2 7 10
5 7 5
7 7 1
1 1

Hence, LCM of 7 and 20 is 2 x 2 x 5 x 7 = 140.

Steps to find lcm of 7 and 20 by Formula

Example: Find lcm of 7 and 20 by Formula

  • GCF of 7 and 20 = 1
  • LCM of 7 and 20 = (7 x 20) / 1
  • => 140 / 1

Hence, LCM of 7 and 20 is 140.

Examples

Franky and Joy are running on a circular track. They start at the same time. They take 7 and 20 minutes respectively to go round once. Find at what time they will run together?

Franky and Joy are running on a circular track. They take 7 and 20 minutes respectively to go round once. We need to find out at what time (minimum) they will run together again. For this we need to find the LCM of 7 and 20.
So, LCM of 7 and 20 is 140.

Boxes that are 7 inches tall are being pilled next to boxes that are 20 inches tall. What is the least height in feet at which the two piles will be the same height?

To find the least height in feet at which the two piles will be at same height we will find LCM of 7 and 20.
So, LCM of 7 and 20 is 140.

Sammy's company prints 7 textbooks at a time. Daniel's company prints textbooks in sets of 20 at a time. According to a survey done by a committee, both companies printed the same number of textbooks last year. Find the least number of books that each company would have printed.

To find the least number of textbooks that each company could have printed we need to find the LCM of 7 and 20.
So, LCM of 7 and 20 is 140.

Ariel exercises every 7 days and Rubel every 20 days. They both excercised today. How many days will it be until they excercise together again?

The problem can be solved using LCM, because we are trying to figure out the least time until they excercise together again.
So, LCM of 7 and 20 is 140.

Find the LCM of 7 and 20 using GCF method.

Greatest common factor or gcf of 7 and 20 is GCF(7, 20) x LCM(7, 20) = (7 x 20) / GCF(7, 20) = 140.

Find the least common multiple of 7 and 20.

Least common multiple of 7 and 20 is 140.

Find the least number which is exactly divisible by 7 and 20.

Least number which is exactly divisible by 7 and 20 is 140.