When simplifying fractions it's useful to know what is the HCF of the numerator and denominator is. When adding or subtracting fractions with different denominators it's useful to know what the LCM of them is.
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The LCM is: 20
GCF and LCM will be most useful in algebra, but can be used in one fashion or another in all areas of mathematics.
The LCM is 598. 13*46=598
Find the GCF when you want to simplify a fraction. Find an LCM when you want to add and subtract fractions.
The lowest common multiple is useful in doing fraction addition. If you use any common multiple then you will need to do more reducing in the answers.
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