Sample Lesson Plan: Addition with Common Denominators
Copyright Conceptua™ Math
Standards and Key Concepts
Unit of Study
Fractions: Addition with Common Denominators
Grade 3-5: Understand the meaning of operations and how they relate to
Understand the meaning and effects of arithmetic operations with
fractions, decimals, and integers.
Grade 4: Build fractions from unit fractions by applying and extending
previous understandings of operations on whole numbers.
3. Understand a fraction a/b with a > 1 as a sum of fractions 1/b.
Understand addition and subtraction of fractions as joining and
separating parts referring to the same whole.
Solve word problems involving addition and subtraction of fractions
referring to the same whole and having like denominators, e.g., by
using visual fraction models and equations to represent the problem.
Fractions are numbers that can be added to solve problems.
Given an addition example of two fractions with common denominators and
various models (circle, area, horizontal bars, vertical bars, sets) the student
will accurately use the models to determine the sum, and correctly record
the sum for 5 or more examples on three consecutive sessions.
1. Students will add like fractions using both models and numbers and
justify their answer.
2. Students will explain what it means when fractions have a common
denominator using the term “like fractions”.
3. Students will identify sets of addends that result in a given sum.
List the vocabulary words and definitions on the board or chart paper
Review the How to use the Identify Fractions tool video at
Set up the Adding with Common Denominator Tool:
Click the Hide/Show fraction button to hide the fraction number.
This lesson plan is an introdu