Help your students show their understanding as they explain how to add fractions with unlike denominators. Use this lesson on its own or as support to the lesson Make It Work! Adding Fractions with Unlike Denominators.
Students will be able to add fractions with unlike denominators.
Students will be able to explain how to add fractions with unlike denominators using visual aids.
Display a visual addition problem with fractions that have the same denominator without the fractions listed using a tape diagram or number line (see the top of the Adding Fractions worksheet for reference).
Ask students to think about what the problem shows for 30 seconds, and then turn and talk to their partner about the problem. Have them use their whiteboards to take notes or solve the problem.
Choose a student to solve the problem on the board and ask the class how they knew they could add the numerators together. Have volunteers share their ideas.
Ask students to look at the vocabulary cards for "alike" and "unlike" and ask them to circle the numbers that are alike and box those that are unlike on each of the cards. Have students turn and talk about something in their lives that is unlike someone else's. For example, "Natasha always brings her lunch to school, but I always get my lunch at school."
Tell students that today they will discuss how to find alike or common denominators in fractions so they can add the fractions together.