Six and three fourths plus four and three tenths equals
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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.
False [ I THINK ]
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
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.