Adding Mixed Numbers with Unlike Denominators

Adding mixed numbers with unlike denominators means combining two mixed numbers that have different denominators. Before adding the fractions, students must find a common denominator so the fractions are divided into equal-sized parts. Then add the whole numbers and the fractions separately. If the fraction answer is improper, regroup it into a mixed number.

A common mistake students make is adding the denominators instead of keeping the denominator the same after finding the common denominator. Another mistake is forgetting to simplify the final answer.