find the HCF and LCM of the following numbers 21,27 solve:-
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Answer:
Greatest common factor (GCF) of 21 and 27 is 3
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HCF
21=3x7
27=3x3x3
3 is common
So HCF is 3
If there had been two numbers than we would multiply them and that would be the answer
LCM is 189
Because
Multiples of 21-
21,42,63,84,105,126,147,168,189,210
Multiples of 27
27,54,81,108,135,162,189,216,243
First common is 189
21=3x7
27=3x3x3
3 is common
So HCF is 3
If there had been two numbers than we would multiply them and that would be the answer
LCM is 189
Because
Multiples of 21-
21,42,63,84,105,126,147,168,189,210
Multiples of 27
27,54,81,108,135,162,189,216,243
First common is 189
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