It can help by when finding the LCD (Least Common Denominator) you find the least number they have in common then that number is your equivalent fraction.
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when you add mixed numbers you have a whole number but adding fraction does not.
To combine the fractions or subtract the fractions. Same method with mixed numbers.
Convert the fractions into equivalent fractions with the same denominator. In actually adding mixed numbers, it is easier to convert the mixed numbers into improper (top heavy) fractions, do the addition, simplify the resulting fraction and convert any resulting improper fraction back into a mixed number.
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you do what makes sense given the numbers, if the fractions work out beautifully, you can just leave them as mixed numbers, otherwise it's best to keep them as improper fractions