# 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:

1. 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:

1. Teach students about fractions as parts of a whole. Students should have some prior knowledge of fractions.
3. Practice together:  Math Learning Center.
1. 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.
2. To make denominators common, you can divide the larger denominator by the smaller and get a multiple.
3. You must multiply the denominator and numerator to make the fractions have common denominators.

4. As you show how to create a common denominator to add fractions, have students help you figure out the multiple.
5. Use the annotate feature to label each math sentence.
1. Practice together:  Math Learning Center.

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:

This was modified from MiTechKids activity:  adding fractions

Remixed with resources from Khan Academy and ck-12