What is LCM of two numbers?

In mathematics, least common multiple which is commonly known as LCM is defined as the smallest non-zero number which is divisible by both given numbers 126 and 28.

Properties of LCM

  • LCM follows associative property, that means LCM(126, 28) = LCM(28, 126).
  • 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 126 and 28 is 252, where 126 and 28 are less than 252.
  • The LCM of two or more prime numbers is their product.

Steps to find lcm of 126 and 28 by Listing Method

Example: Find lcm of 126 and 28 by Listing Method

  • Multiples of 126: 126, 252, 378, 504, 630, 756, 882, 1008, 1134, 1260, 1386, 1512, 1638, 1764, 1890, 2016, 2142, 2268, 2394, 2520, 2646, 2772, 2898, 3024, 3150, 3276, 3402, 3528
  • Multiples of 28: 28, 56, 84, 112, 140, 168, 196, 224, 252, 280, 308, 336, 364, 392, 420, 448, 476, 504, 532, 560, 588, 616, 644, 672, 700, 728, 756, 784, 812, 840, 868, 896, 924, 952, 980, 1008, 1036, 1064, 1092, 1120, 1148, 1176, 1204, 1232, 1260, 1288, 1316, 1344, 1372, 1400, 1428, 1456, 1484, 1512, 1540, 1568, 1596, 1624, 1652, 1680, 1708, 1736, 1764, 1792, 1820, 1848, 1876, 1904, 1932, 1960, 1988, 2016, 2044, 2072, 2100, 2128, 2156, 2184, 2212, 2240, 2268, 2296, 2324, 2352, 2380, 2408, 2436, 2464, 2492, 2520, 2548, 2576, 2604, 2632, 2660, 2688, 2716, 2744, 2772, 2800, 2828, 2856, 2884, 2912, 2940, 2968, 2996, 3024, 3052, 3080, 3108, 3136, 3164, 3192, 3220, 3248, 3276, 3304, 3332, 3360, 3388, 3416, 3444, 3472, 3500, 3528

Hence, LCM of 126 and 28 is 252.

Steps to find LCM of 126 and 28 by Common Division Method

Example: Find lcm of 126 and 28 by Common Division Method

2 126 28
2 63 14
3 63 7
3 21 7
7 7 7
1 1

Hence, LCM of 126 and 28 is 2 x 2 x 3 x 3 x 7 = 252.

Steps to find lcm of 126 and 28 by Formula

Example: Find lcm of 126 and 28 by Formula

  • GCF of 126 and 28 = 14
  • LCM of 126 and 28 = (126 x 28) / 14
  • => 3528 / 14

Hence, LCM of 126 and 28 is 252.

Examples

Franky and Joy are running on a circular track. They start at the same time. They take 126 and 28 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 126 and 28 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 126 and 28.
So, LCM of 126 and 28 is 252.

A shopkeeper sells candies in packet of 126 and chocolates in packet of 28. 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 126 and 28.
So, LCM of 126 and 28 is 252.

Both the cricket team and the rugby team had games, today. The cricket team plays every 126 days and the basketball team plays every 28 days. When will both teams have games on the same day again?

Given that the cricket team plays every 126 days and the basketball team plays every 28 days, so for finding the next time when both teams will play again we need to find the LCM of 126 and 28.
So, LCM of 126 and 28 is 252.

Freddy saves 126 dollars every day while Nikki saves 28 dollars every day. What is the least number of days it will take each person to save the same amount of money?

To find the least number of days that would be taken to be able to save the same amount of dollars we need to find the LCM of 126 and 28.
So, LCM of 126 and 28 is 252.

Boxes that are 126 inches tall are being pilled next to boxes that are 28 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 126 and 28.
So, LCM of 126 and 28 is 252.

Sammy's company prints 126 textbooks at a time. Daniel's company prints textbooks in sets of 28 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 126 and 28.
So, LCM of 126 and 28 is 252.

Ariel exercises every 126 days and Rubel every 28 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 126 and 28 is 252.