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Study Guides > Prealgebra

Introduction to Adding and Subtracting Fractions With Common Denominators

A classroom with a teacher standing in front of a chalkboard with math problems written on it, while students watch him What fraction of students did well on the latest test?
In math class, Mike's teacher shares that 1/8 of the students received an A on the latest test and 3/8 of the students received a B. Mike wants to figure out what fraction of the class got either an A or B on the test. To do this, he'll have to add fractions. In this section, we'll use models to explore how to add and subtract fractions with common denominators.  

Learning Outcomes

By the end of this section, you will be able to:
  • Model fraction addition
  • Add fractions with a common denominator
  • Model fraction subtraction
  • Subtract fractions with a common denominator
 

readiness quiz

Before you get started, take this readiness quiz. 1) [ohm_question]144900[/ohm_question] If you missed this problem, review this video. https://youtu.be/KMUCQ_Pwt7o 2) Draw a model of the fraction [latex]\frac{3}{4}[/latex].

Answer:

If you missed this problem, review this video. https://youtu.be/akyByv80Uzc 3) [ohm_question]146163[/ohm_question] If you missed this problem, review this video. https://youtu.be/eF_jiZvb79w
 

Licenses & Attributions

CC licensed content, Original

  • Simplify Expressions by Combining Like Terms (No Negatives). Authored by: James Sousa (Mathispower4u.com) for Lumen Learning. License: Public Domain: No Known Copyright.

CC licensed content, Shared previously

  • Math Classroom. Located at: https://commons.wikimedia.org/wiki/File:Math_class_in_Da_Ji_Junior_High_School_2006-12-1.jpg. License: CC BY-SA: Attribution-ShareAlike.
  • Simplify Basic Expressions in Fraction Form. Authored by: James Sousa (Mathispower4u.com) . License: CC BY: Attribution.
  • Draw Models of Fractions and Explain the Meaning of the Fraction. Authored by: James Sousa (Mathispower4u.com). License: CC BY: Attribution.

CC licensed content, Specific attribution