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Question
Find out the LCM of the following number:
15, 20
Solution
Multiples of 15 = 15, 30, 45, 60, 75, 90, 105, 120,...
Multiples of 20 = 20, 40, 60, 80, 100, 120,...
Common multiples of 15 and 20: 60, 120,...
∴ LCM of 15 and 20 = 60
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16, 28, 40, 77
In a morning walk, three persons step off together. Their steps measure 80 cm, 85 cm, and 90 cm respectively. What is the minimum distance each should walk so that all can cover the same distance in complete steps?
Find the LCM set of numbers using prime factorisation method.
30, 40, 60
Find the smallest number which is exactly divisible by all the numbers from 1 to 9
Find first three common multiples of the given number.
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There is a garden in Anu’s house. In the middle of the garden there is a path. They decided to tile the path using tiles of length 2 feet, 3 feet and 5 feet.
The mason tiled the first row with 2 feet tiles, the second row with 3 feet tiles and the third row with 5 feet tiles. The mason has not cut any of the tiles. Then what is the shortest length of the path?
