What does LCM mean in mathematics?

The least common multiple or LCM of two numbers 98 and 70 is defined as the smallest positive integer which is divisible by both of them. It is represented by LCM(98, 70).

Properties of LCM

  • LCM follows associative property, that means LCM(98, 70) = LCM(70, 98).
  • 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 98 and 70 is 490, where 98 and 70 are less than 490.
  • The LCM of two or more prime numbers is their product.

Steps to find lcm of 98 and 70 by Listing Method

Example: Find lcm of 98 and 70 by Listing Method

  • Multiples of 98: 98, 196, 294, 392, 490, 588, 686, 784, 882, 980, 1078, 1176, 1274, 1372, 1470, 1568, 1666, 1764, 1862, 1960, 2058, 2156, 2254, 2352, 2450, 2548, 2646, 2744, 2842, 2940, 3038, 3136, 3234, 3332, 3430, 3528, 3626, 3724, 3822, 3920, 4018, 4116, 4214, 4312, 4410, 4508, 4606, 4704, 4802, 4900, 4998, 5096, 5194, 5292, 5390, 5488, 5586, 5684, 5782, 5880, 5978, 6076, 6174, 6272, 6370, 6468, 6566, 6664, 6762, 6860
  • Multiples of 70: 70, 140, 210, 280, 350, 420, 490, 560, 630, 700, 770, 840, 910, 980, 1050, 1120, 1190, 1260, 1330, 1400, 1470, 1540, 1610, 1680, 1750, 1820, 1890, 1960, 2030, 2100, 2170, 2240, 2310, 2380, 2450, 2520, 2590, 2660, 2730, 2800, 2870, 2940, 3010, 3080, 3150, 3220, 3290, 3360, 3430, 3500, 3570, 3640, 3710, 3780, 3850, 3920, 3990, 4060, 4130, 4200, 4270, 4340, 4410, 4480, 4550, 4620, 4690, 4760, 4830, 4900, 4970, 5040, 5110, 5180, 5250, 5320, 5390, 5460, 5530, 5600, 5670, 5740, 5810, 5880, 5950, 6020, 6090, 6160, 6230, 6300, 6370, 6440, 6510, 6580, 6650, 6720, 6790, 6860

Hence, LCM of 98 and 70 is 490.

Steps to find LCM of 98 and 70 by Common Division Method

Example: Find lcm of 98 and 70 by Common Division Method

2 98 70
5 49 35
7 49 7
7 7 1
1 1

Hence, LCM of 98 and 70 is 2 x 5 x 7 x 7 = 490.

Steps to find lcm of 98 and 70 by Formula

Example: Find lcm of 98 and 70 by Formula

  • GCF of 98 and 70 = 14
  • LCM of 98 and 70 = (98 x 70) / 14
  • => 6860 / 14

Hence, LCM of 98 and 70 is 490.

Examples

A shopkeeper sells candies in packet of 98 and chocolates in packet of 70. 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 98 and 70.
So, LCM of 98 and 70 is 490.

Both the cricket team and the rugby team had games, today. The cricket team plays every 98 days and the basketball team plays every 70 days. When will both teams have games on the same day again?

Given that the cricket team plays every 98 days and the basketball team plays every 70 days, so for finding the next time when both teams will play again we need to find the LCM of 98 and 70.
So, LCM of 98 and 70 is 490.

Steve spends 98 dollars every day while George spends 70 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 98 and 70.
So, LCM of 98 and 70 is 490.

Sammy's company prints 98 textbooks at a time. Daniel's company prints textbooks in sets of 70 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 98 and 70.
So, LCM of 98 and 70 is 490.

Ariel exercises every 98 days and Rubel every 70 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 98 and 70 is 490.

Find the least common multiple of 98 and 70.

Least common multiple of 98 and 70 is 490.

Find the least number which is exactly divisible by 98 and 70.

Least number which is exactly divisible by 98 and 70 is 490.