Common denominator
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I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.
When adding or subtracting fractions their denominators must be the same
A Common Denominator
you must make the fractions equivalent and with the same denomenator
Similarities: the sum does not depend on which number you start with (distributive)Differences: you must find a common denominator for the fractions (whole numbers have a common denominator [1]