# Adding Fractions with unlike denominators

## OVERVIEW

The math learning center is an app and online platform that allows students to use manipulatives virtually. In this activity, students will use virtual manipulatives to add fractions.

## LEARNING OBJECTIVES

**Students will:**

- Be able to make two fraction addition problems using The Math Learning Center App.

## VOCABULARY

**Vocabulary Words:**

**Fraction**: A fraction is a part of a whole. A common fraction is made up of a numerator and a denominator. The numerator is shown on top of a line and is the number of parts of the whole. The denominator is shown below the line and is the number of parts by which the whole has been divided.

## PRE-PLANNING

**To prepare for this lesson:**

- Teachers will need to have the app or website for virtual manipulatives available to students.

**Note**: The Math Learning Center has many free apps available for teachers and students. For more information, visit the Math Learning Center.

## ACCOMMODATIONS

See Accommodations Page and Charts on the 21things4students.net site in the Teacher Resources.

## STEPS

**Directions for this activity:**

- Teach students about fractions as parts of a whole. Students should have some prior knowledge of fractions.
- Show video: https://goopenmichigan.org/courses/adding-fractions-with-different-denominators/view
- Practice together: Math Learning Center.

- Explain to students that when adding fractions, they have to have equivalent parts. For example, if a fraction’s denominator is 12, the fraction it’s added with must also have 12 as the denominator, thus have a common denominator.
- To make denominators common, you can divide the larger denominator by the smaller and get a multiple.
- You must multiply the denominator and numerator to make the fractions have common denominators.
- As you show how to create a common denominator to add fractions, have students help you figure out the multiple.
- Use the annotate feature to label each math sentence.

- Video 2: https://www.khanacademy.org/math/in-sixth-grade-math/fractions-1/addition-subtraction-fractions/v/adding-fractions-with-unlike-denominators
- Practice Together:

- Practice together: Math Learning Center.

- Video 3: https://www.khanacademy.org/math/in-sixth-grade-math/fractions-1/addition-subtraction-fractions/v/adding-fractions-ex-1
- Practice: https://www.khanacademy.org/math/in-sixth-grade-math/fractions-1/addition-subtraction-fractions/e/adding_fractions

**Note**: Early finishers may screenshot their work and save it to their computer or upload to an electronic portfolio like SeeSaw.

## ASSESSMENT OPTIONS

**Different options for assessing the students:**

- Observations
- Teachers see what students have done through observation. They can intervene if students are struggling with equivalency.
- Check for understanding: https://goopenmichigan.org/courses/adding-fractions-with-different-denominators/view

This was modified from MiTechKids activity: adding fractions

Remixed with resources from Khan Academy and ck-12