Any job where you need to add or subtract fractions.
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The HCF helps when reducing fractions. The LCM helps when adding or subtracting fractions.
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LCM is used to find the lowest common denominator in fractions HCF is used to reduce fractions to their simplest terms
In finding the LCM or HCF of two or more numbers
For adding and subtracting fractions with different denominators and reducing them to their lowest terms.