What is the HCF of 9 and 12?

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Answer 1 · 2017-09-07T23:52:33

Highest common factor (H.C.F) of two or more numbers is the greatest number which divides each of them exactly.

First we can factor #9#:

#9 = 3 xx 3#

Then we can factor #12#:

#12 = 2 xx 2 xx 3#

The common factors are:

#3#

Therefore, the HCF is: #color(red)(3)#

Answer 2 · 2017-09-10T08:44:48

#3#

for small numbers listing all the factors can work out to be quicker

#hcf(9,12)#

factors #9: {color(red)(1,3),9}#

factors #12:{color(red)(1),2,color(red)(3),4,6,12}#

The common factors are in red.

so the #hcf=color(red)3#