When we will come to know that whether we have to find hcf or lcm?

### Asked by shanayakhatter27 | 28th Jun, 2019, 11:59: PM

Expert Answer:

### When we have to find the highest number that can divide the given set of numbers, then we have to find HCF.
Example:
Arranging 6 math books and 10 science books (seperately) on the self such that their height is same.
here we need to divide the books equally amongst the rows, that means we need to find highest number that can divide both 6 and 10, so HCF.
When we have to find the smallest number that can be divided by all the given set of numbers, then we find LCM.
Example:
A bell rings every 18 seconds, another every 60 seconds. At 5.00 pm the two ring simultaneously. At what time will the bells ring again at the same time?
Here we have to find the lowest number that be divisible both by 18 and 60, so LCM.

### Answered by Arun | 29th Jun, 2019, 10:07: AM

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