![]() Further, when you add or subtract quantities with like units, their units do not change. This explains why one must find a common denominator to be able to add fractions with unlike denominators when adding and subtracting fractions. Just like one cannot add 4 pencils and 3 bananas to have 7 of anything of meaning (unless one changes the unit of both to “objects”), the same applies for the units of fractions (their denominators).
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