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Yes providing you change the fractions into decimals or change the decimals into fractions
By finding the lowest common multiple of the fractions with different denomiators that need to be added or subtracted
It is best to convert the mixed fraction to an improper fraction. They are then added together in the same way as proper fractions are added together.
Mixed numbers can be converted to improper fractions. Improper fractions can be added the same way proper fractions are.
That simply means that the fractions have different denominators. Such fractions cannot be directly added, subtracted, or compared; you have to convert them to a common denominator first.