Math Tutor 4 - Version A Math Tutor 4 is a set of three tutorials that continue with the topic of adding and subtracting fractions, and introduce the concept of multiplying a fraction by a whole number and dividing one fraction by another. The first tutorial shows the student how to add and subtract two mixed fractions by first changing them to improper fractions. The second tutorial shows the student how to multiply a fraction by an integer, and how to divide one fraction by another. The third tutorial describes how to add or subtract fractions with slightly different denominators. Each tutorial is followed by a set of problems for the student to answer.