Section 1
The 'Like Units' Rule for Adding Fractions
Property
To add fractions, they must have like units, meaning a common denominator. You can only add the numerators when the denominators are the same.
In this Grade 5 Eureka Math lesson from Chapter 16, students learn how to add fractions with unlike denominators by converting them into equivalent fractions with common units. Using paper folding and rectangular area models, students practice renaming fractions such as one-half and one-fourth into like units before adding. The lesson builds on fluency with equivalent fractions and prepares students to add unlike unit fractions accurately and efficiently.
Section 1
The 'Like Units' Rule for Adding Fractions
To add fractions, they must have like units, meaning a common denominator. You can only add the numerators when the denominators are the same.
Section 2
Adding Unlike Fractions with a Rectangular Model
To add two fractions and using a rectangular model, partition a whole rectangle vertically into parts and horizontally into parts. This creates a common denominator of .
The sum is then calculated by adding the equivalent fractions:
Expand to review the lesson summary and core properties.
Section 1
The 'Like Units' Rule for Adding Fractions
To add fractions, they must have like units, meaning a common denominator. You can only add the numerators when the denominators are the same.
Section 2
Adding Unlike Fractions with a Rectangular Model
To add two fractions and using a rectangular model, partition a whole rectangle vertically into parts and horizontally into parts. This creates a common denominator of .
The sum is then calculated by adding the equivalent fractions: