They are usually easier to comprehend.
Many people would find it hard to relate 639/852 to anything but most of them would be comfortable with 3/4, the reduced version of the fraction.
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For the purpose of reducing fractions to their lowest terms.
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In order to find the LCD when adding or subtracting fractions
The HCF helps when reducing fractions. The LCM helps when adding or subtracting fractions.
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