What is the LCM of 90 and 20 - Find out answer step by step

Definition of LCM

LCM stands for least common multiple. In mathematics, LCM of two numbers 90 and 20, is defined as the smallest positive integer that is divisible by both. It is written as LCM(90, 20).

Properties of LCM

LCM follows associative property, that means LCM(90, 20) = LCM(20, 90).
LCM follows commutative property, which means LCM(a, b, c) = LCM(LCM(a, b), c) = LCM(a, LCM(b, c)).
LCM follows distributive property, which means LCM(ab, bc, ad) = d * LCM(x, y, z).
The LCM of two given numbers is never less than any of those numbers. Eg- LCM of 90 and 20 is 180, where 90 and 20 are less than 180.
The LCM of two or more prime numbers is their product.

Steps to find lcm of 90 and 20 by Listing Method

Find some first multiples of 90 and 20.
Find the least common multiple, and read off the answer!

Example: Find lcm of 90 and 20 by Listing Method

Multiples of 90: 90, 180, 270, 360, 450, 540, 630, 720, 810, 900, 990, 1080, 1170, 1260, 1350, 1440, 1530, 1620, 1710, 1800
Multiples of 20: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, 500, 520, 540, 560, 580, 600, 620, 640, 660, 680, 700, 720, 740, 760, 780, 800, 820, 840, 860, 880, 900, 920, 940, 960, 980, 1000, 1020, 1040, 1060, 1080, 1100, 1120, 1140, 1160, 1180, 1200, 1220, 1240, 1260, 1280, 1300, 1320, 1340, 1360, 1380, 1400, 1420, 1440, 1460, 1480, 1500, 1520, 1540, 1560, 1580, 1600, 1620, 1640, 1660, 1680, 1700, 1720, 1740, 1760, 1780, 1800

Hence, LCM of 90 and 20 is 180.

Steps to find LCM of 90 and 20 by Common Division Method

Find all the prime numbers that would divide 90 and 20 without leaving any remainder.
Multiply the numbers obtained in step 1, and read off the answer!

Example: Find lcm of 90 and 20 by Common Division Method

2	90 20
2	45 10
3	45 5
3	15 5
5	5 5
	1 1

Hence, LCM of 90 and 20 is 2 x 2 x 3 x 3 x 5 = 180.

Steps to find lcm of 90 and 20 by Formula

The formula for LCM is LCM (90, 20) = (90 x 20) / GCF (90, 20)
Apply the formula, and read off the answer!

Example: Find lcm of 90 and 20 by Formula

GCF of 90 and 20 = 10
LCM of 90 and 20 = (90 x 20) / 10
=> 1800 / 10

Hence, LCM of 90 and 20 is 180.

Examples

A shopkeeper sells candies in packet of 90 and chocolates in packet of 20. What is the least number of candies and chocolates Annie should buy so that there will be one candy for each chocolate?

The least number of candies and chocolates Annie should buy so that there will be one candy for each chocolate we need to find the lcm of 90 and 20.
So, LCM of 90 and 20 is 180.

Both the cricket team and the rugby team had games, today. The cricket team plays every 90 days and the basketball team plays every 20 days. When will both teams have games on the same day again?

Given that the cricket team plays every 90 days and the basketball team plays every 20 days, so for finding the next time when both teams will play again we need to find the LCM of 90 and 20.
So, LCM of 90 and 20 is 180.

Steve spends 90 dollars every day while George spends 20 dollars every day. What is the least number of days it will take each person to spend the same amount of money?

To find the least number of days that would be taken to be able to spend the same amount of dollars we need to find the LCM of 90 and 20.
So, LCM of 90 and 20 is 180.

Sammy's company prints 90 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 90 and 20.
So, LCM of 90 and 20 is 180.

Ariel exercises every 90 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 90 and 20 is 180.

Find the least common multiple of 90 and 20.

Least common multiple of 90 and 20 is 180.

Find the least number which is exactly divisible by 90 and 20.

Least number which is exactly divisible by 90 and 20 is 180.

What is LCM of 90 and 20?

How to find lcm of two numbers

Definition of LCM

Properties of LCM

Steps to find lcm of 90 and 20 by Listing Method

Example: Find lcm of 90 and 20 by Listing Method

Steps to find LCM of 90 and 20 by Common Division Method

Example: Find lcm of 90 and 20 by Common Division Method

Steps to find lcm of 90 and 20 by Formula

Example: Find lcm of 90 and 20 by Formula

Examples

What is LCM of 90 and 20?

How to find lcm of two numbers

Definition of LCM

Properties of LCM

Steps to find lcm of 90 and 20 by Listing Method

Example: Find lcm of 90 and 20 by Listing Method

Steps to find LCM of 90 and 20 by Common Division Method

Example: Find lcm of 90 and 20 by Common Division Method

Steps to find lcm of 90 and 20 by Formula

Example: Find lcm of 90 and 20 by Formula

Examples

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