They have to have a common denominator
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What is the definition of Adding and Subtracting Like Fractions
adding fractions
For adding or substracting fractions first of all we should calculate the LCM( Lowest Common Multiplier) of the denominators in both of the fractions.
When adding or subtracting fractions first make sure that the denominators are the same if they aren't then find the lowest common denominator and alter the fractions accordingly
when you add mixed numbers you have a whole number but adding fraction does not.