Question

5. Find out the lowest number which is exactly divisible by 36,45,63 and 80.​

Answer 1

Factor all the numbers.

36 =2*2*3*3

45=3*3*5

63=3*3*7

80=2*2*2*2*5

36 and 80 have 2*2 common.

36, 45 and 63 have 3*3 common

45 and 80 have 5 common.

Count all the factors that are common in two or more of the numbers only once.

So, the lowest common multiple is

2*2*3*3*5* any other factors which are not common, ie. 7 and the extra 2*2 for 80

Hence, LCM = 2*2*3*3*5*2*2*7 = 5040

Answer 2

Answer:

The LCM of these numbers is the answer of your question.