It means finding the lowest common denominator.
So if your fraction is 10/32 (ten over thirty-two) you can reduce this by dividing the top and bottom by two. You'll get 5/16 (five over sixteen). There are no other numbers that you can evenly divide the top and bottom numbers by, so you have successfully reduced this fraction.
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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.
Factor :D
By reducing them to their lowest terms