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It is not always necessary to find the least common denominator to compare the sizes of fractions. When comparing fractions with the same denominator, you can simply compare the numerators. If the denominators are different, you can find a common denominator by multiplying the denominators together, but it is not always required for comparison. Alternatively, you can convert the fractions to decimals for easier comparison in some cases.
Make them into decimals. Make them into decimals.
You might think that 1/4 is greater than 1/3 because 4 is greater than 3. If you know that 1/3 = 4/12 and 1/4 = 3/12, it makes them easier to compare.
One way to compare two fractions is to convert both to a common denominator. Then the only difference is in the numerator. Comparison of the numerator is then sufficient to compare the fractions. A percentage is equivalent to converting the fractions to a denominator of 100.
Since 4 is greater than 3, you might think that 1/4 is greater than 1/3. But if you know that 1/3 = 4/12 and 1/4 = 3/12, it makes them easier to compare.