What is the HCF and LCM of 120?

The LCM of 120 and 200 is 600.

Steps to find LCM

  1. Find the prime factorization of 120
    120 = 2 × 2 × 2 × 3 × 5
  2. Find the prime factorization of 200
    200 = 2 × 2 × 2 × 5 × 5
  3. Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:

    LCM = 2 × 2 × 2 × 3 × 5 × 5

  4. LCM = 600

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Find least common multiple (LCM) of: 240 & 400 60 & 100 360 & 600 600 & 1000 24 & 40 840 & 1400 240 & 200 120 & 400 360 & 200 120 & 600 600 & 200 120 & 1000 840 & 200 120 & 1400

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What is the HCF and LCM of 120?

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Concept

HCF : The greatest common divisor of two or more positive integers happens to be the largest positive integer that divides the numbers without leaving a remainder.
LCM : The Least common multiple or lowest common multiple, or smallest common multiple of two integers a and b, usually denoted by l.c.m.(a, b), is the smallest positive integer that is divisible by both a and b.

Co-prime : Two numbers are co-prime if they no common factor other than 1.

Formula used

Product of numbers = LCM × HCF

Calculation

HCF = 10

So, let the two numbers be 10a and 10b, where 'a' and 'b' are co-primes 
LCM of two numbers = 120

⇒ 10a × 10b = LCM × HCF

⇒ 100 ab = 1200

⇒ ab = 12 Therefore, possible pairs of a and b could be 

(3,4)

So, the numbers are (30, 40)
Hence, their sum is 70.

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LCM of 120 and 150 is 600. LCM denotes the smallest positive number that is a multiple of two or more numbers. The article LCM with Examples will explain the concept in a comprehensive manner so that students obtain good marks in examinations. This article acts as a tool for students to learn and revise the concepts in a better way. Let us learn how to determine the least common multiple of 120 and 150 with a complete explanation here.

What is LCM of 120 and 150?

The Least Common Multiple of 120 and 150 is 600.

What is the HCF and LCM of 120?

How to Find LCM of 120 and 150?

LCM of 120 and 150 can be determined using three methods:

  • Prime Factorisation
  • Division method
  • Listing the Multiples

LCM of 120 and 150 Using Prime Factorisation Method

In the prime factorisation method, LCM of 120 and 150 can be obtained by multiplying prime factors raised to their respective highest power.

120 = 2 × 2 × 2 × 3 × 5

150 = 2 × 3 × 5 × 5

LCM (120, 150) = 2 × 2 × 2 × 3 × 5 × 5 = 600

LCM of 120 and 150 Using Division Method

In the division method, to find the LCM, we divide the numbers 120 and 150 by their prime factors until we get the result as one in the complete row. The product of these divisors shows the least common multiple of 120 and 150.

2 120 150
2 60 75
2 30 75
3 15 75
5 5 25
5 1 5
x 1 1

No further division can be done.

Hence, LCM (120, 150) = 2 × 2 × 2 × 3 × 5 × 5 = 600

LCM of 120 and 150 Using Listing the Multiples

In this method, we list down the multiples of given natural numbers to find the least common multiple among them. Let us have a look at the multiples of 120 and 150 from the table given below.

Multiples of 120 Multiples of 150
120 150
240 300
360 450
480 600
600 750

LCM (120, 150) = 600

Video Lesson on Applications of LCM

What is the HCF and LCM of 120?

Solved Examples 

1. What is the smallest number that is divisible by both 120 and 150?

Solution: 600 is the smallest number that is divisible by both 120 and 150.

2. The GCD and LCM of the two numbers are 30 and 600. If one number is 150, what is the other number?

Solution: Let the other number be z

We know that, 

GCD × LCM = 150 × z

z = (GCD × LCM) / 150

z = (30 × 600) / 150

z = 120

Thus the other number is 120.

The LCM of 120 and 150 is 600.

No. The LCM of 120 and 150 is 600 and the HCF of 120 and 150 is 30.

The methods used to find the least common multiple of 120 and 150 are

Prime Factorisation

Division method

Listing the Multiples

GCF × LCM = 120 × 150

Given

LCM = 600

GCF × 600 = 120 × 150

GCF = 30

Here, we write the numbers as the product of prime factors to find the LCM

120 = 2 × 2 × 2 × 3 × 5

150 = 2 × 3 × 5 × 5

LCM (120, 150) = 2 × 2 × 2 × 3 × 5 × 5 = 600