When the denominators of two or more fractions are the SAME, then they can be added or subtracted directly. An easy way is to multiply each denominator by the other (along with its corresponding numerator).
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Adding like terms can be like adding fractions. You can only add fractions with a common denomonator. You can only combine terms together if they are like. Think of like terms as denomonators. You can only add if they are like.
Change them to like fractions and proceed.
The answer depends on how fluently you can work with fractions.
First, change it so that the two fractions have the same denominator (by changing the fractions into equivalent fractions). Once the two fractions have the same denominator, it is simply a case of subtracting the numerators, leaving the denominator the same. Finally, reduce the fraction to its lowest terms (if possible).
Yes providing you change the fractions into decimals or change the decimals into fractions