Question

The LCM of 2 numbers is 819. if the numbers are 63 and 117 find their HCF

Answer 1

Answer:

LCM x HCF =ab

819x HCF= 63 x 117

HCF =9

Answer 2

Answer:

there are two important methods to find the HCF,

first method

finding factors of 63 and 117

63= 3 x 3 x 7

117= 3 x 3 x 13

here common factors are 3 x 3= 9

therefore the HCF will be 9

now second method

LCM x HCF= product of the two numbers

819 x HCF= 7371

HCF= 7371/819

HCF= 9

so from these two methods, you can find the hcf

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