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    how can the biggest number be 3 ? isn't it meant to be 18 ?

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    H.C.F of 3 and 6 is 3 because 3 can divide bothe 6 and 3. 18 is not a factor.
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    (Original post by Wildnatxox)
    how can the biggest number be 3 ? isn't it meant to be 18 ?

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    The factors of 3 are 1 and 3.

    The factors of 6 are 1,2,3 and 6.

    The highest common factor is 3.

    You might be thinking of multiples?
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    The biggest number that can divide the 2 numbers shown is 3 (without decimals obviously.) You are probably thinking of lowest common multiples, in this case, it would be 6. (multiplying the numbers to find the lcm is not good practice since it can be wrong on many occasions.)
 
 
 
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