What is the LCM of 20 and 245 - Find out answer step by step

Definition of LCM

LCM stands for least common multiple. In mathematics, LCM of two numbers 20 and 245, is defined as the smallest positive integer that is divisible by both. It is written as LCM(20, 245).

Properties of LCM

The LCM of two given numbers is never less than any of those numbers. Eg- LCM of 20 and 245 is 980, where 20 and 245 are less than 980.
LCM is associative which means LCM(20, 245) = LCM(245, 20).
LCM is commutative which means LCM(a, b, c) = LCM(LCM(a, b), c) = LCM(a, LCM(b, c)).
LCM is distributive, which means LCM(ab, bc, ad) = d * LCM(x, y, z).
The LCM of two or more prime numbers is their product.

Steps to find lcm of 20 and 245 by Listing Method

Find some first multiples of 20 and 245.
Find the least common multiple, and read off the answer!

Example: Find lcm of 20 and 245 by Listing Method

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, 1820, 1840, 1860, 1880, 1900, 1920, 1940, 1960, 1980, 2000, 2020, 2040, 2060, 2080, 2100, 2120, 2140, 2160, 2180, 2200, 2220, 2240, 2260, 2280, 2300, 2320, 2340, 2360, 2380, 2400, 2420, 2440, 2460, 2480, 2500, 2520, 2540, 2560, 2580, 2600, 2620, 2640, 2660, 2680, 2700, 2720, 2740, 2760, 2780, 2800, 2820, 2840, 2860, 2880, 2900, 2920, 2940, 2960, 2980, 3000, 3020, 3040, 3060, 3080, 3100, 3120, 3140, 3160, 3180, 3200, 3220, 3240, 3260, 3280, 3300, 3320, 3340, 3360, 3380, 3400, 3420, 3440, 3460, 3480, 3500, 3520, 3540, 3560, 3580, 3600, 3620, 3640, 3660, 3680, 3700, 3720, 3740, 3760, 3780, 3800, 3820, 3840, 3860, 3880, 3900, 3920, 3940, 3960, 3980, 4000, 4020, 4040, 4060, 4080, 4100, 4120, 4140, 4160, 4180, 4200, 4220, 4240, 4260, 4280, 4300, 4320, 4340, 4360, 4380, 4400, 4420, 4440, 4460, 4480, 4500, 4520, 4540, 4560, 4580, 4600, 4620, 4640, 4660, 4680, 4700, 4720, 4740, 4760, 4780, 4800, 4820, 4840, 4860, 4880, 4900
Multiples of 245: 245, 490, 735, 980, 1225, 1470, 1715, 1960, 2205, 2450, 2695, 2940, 3185, 3430, 3675, 3920, 4165, 4410, 4655, 4900

Hence, LCM of 20 and 245 is 980.

Steps to find LCM of 20 and 245 by Common Division Method

Find all the prime numbers that would divide 20 and 245 without leaving any remainder.
Multiply the numbers obtained in step 1, and read off the answer!

Example: Find lcm of 20 and 245 by Common Division Method

2	20 245
2	10 245
5	5 245
7	1 49
7	1 7
	1 1

Hence, LCM of 20 and 245 is 2 x 2 x 5 x 7 x 7 = 980.

Steps to find lcm of 20 and 245 by Formula

The formula for LCM is LCM (20, 245) = (20 x 245) / GCF (20, 245)
Apply the formula, and read off the answer!

Example: Find lcm of 20 and 245 by Formula

GCF of 20 and 245 = 5
LCM of 20 and 245 = (20 x 245) / 5
=> 4900 / 5

Hence, LCM of 20 and 245 is 980.

Examples

Ram and Deepika are running on a circular track. They start at the same time. They take 20 and 245 minutes respectively to go round once. Find at what time they will run together?

Ram and Deepika are running on a circular track. They take 20 and 245 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 20 and 245.
So, LCM of 20 and 245 is 980.

A shopkeeper sells candies in packet of 20 and chocolates in packet of 245. 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 20 and 245.
So, LCM of 20 and 245 is 980.

What is the relation between LCM and GCF( Greatest Common Factor)?

Greatest common factors or gcf of 20 and 245 is GCF(20, 245) * LCM(20, 245) = (20 x 245) / GCF(20, 245) = 980.

Sammy's company prints 20 textbooks at a time. Daniel's company prints textbooks in sets of 245 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 20 and 245.
So, LCM of 20 and 245 is 980.

Mary exercises every 20 days and Nikki every 245 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 20 and 245 is 980.

Find the least common multiple of 20 and 245.

Least common multiple of 20 and 245 is 980.

Find the least number which is exactly divisible by 20 and 245.

Least number which is exactly divisible by 20 and 245 is 980.

What is LCM of 20 and 245?

How to find lcm of two numbers

Definition of LCM

Properties of LCM

Steps to find lcm of 20 and 245 by Listing Method

Example: Find lcm of 20 and 245 by Listing Method

Steps to find LCM of 20 and 245 by Common Division Method

Example: Find lcm of 20 and 245 by Common Division Method

Steps to find lcm of 20 and 245 by Formula

Example: Find lcm of 20 and 245 by Formula

Examples

What is LCM of 20 and 245?

How to find lcm of two numbers

Definition of LCM

Properties of LCM

Steps to find lcm of 20 and 245 by Listing Method

Example: Find lcm of 20 and 245 by Listing Method

Steps to find LCM of 20 and 245 by Common Division Method

Example: Find lcm of 20 and 245 by Common Division Method

Steps to find lcm of 20 and 245 by Formula

Example: Find lcm of 20 and 245 by Formula

Examples

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