This set of addition and subtraction of fractions and mixed number task cards provides differentiation and challenge! If you are teaching fractions and mixed numbers, this is no "fill in the blank" worksheet, but instead is a rich problem-solving fraction activity. Estimating and the "guess and check" strategies are key as students look to solve these differentiated fraction puzzles. Simple denominators are used (2, 4, 8 for the first 3 sets and 2, 3, 4, 6, 8, 12 for the final set) and only “li