# Adding and Subtracting Fractions with Unlike Denominators - 3 Day Lesson        Subject
Resource Type
File Type

Presentation (Powerpoint) File

(380 KB|25 pages)
Standards
• Product Description
• StandardsNEW
This is a 3 day PowerPoint lesson to teach and show how to add and subtract fractions with unlike denominators. Best used with SMARTBoards (or equivalent) to allow students the opportunity to come to the board.

On day 1 students will...
*Visually see fraction bars used for addition of fractions with unlike denominators
*Create common denominators by changing one fraction only

On day 2 students will...
*Visually see fraction bars used for addition of fractions with unlike denominators
*Create common denominators using the LCM of 2 denominators

On day 3 students will...
*Visually see fraction bars used for subtraction of fractions with unlike denominators
*Create common denominators using the LCM of 2 denominators

***In need of other lessons? Check these out!
Introduction to Fractions 2 Day Lesson
Equivalent Fractions- 2 Day Lesson
Compare and Order Fractions 3 Day Lesson
Mixed Numbers and Improper Fractions LessonAdding and Subtracting Fractions with Like Denominators LessonMultiply Fractions by Whole Number LessonFractions of a Group-2 day PowerPoint LessonMixed Numbers on a Number Line
Multiplying Fractions on a Number LineFractional Line Plot Data
Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, 𝘢/𝘣 + 𝘤/𝘥 = (𝘢𝘥 + 𝘣𝘤)/𝘣𝘥.)
Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.
Compare two fractions with different numerators and different denominators, e.g., by creating common denominators or numerators, or by comparing to a benchmark fraction such as 1/2. Recognize that comparisons are valid only when the two fractions refer to the same whole. Record the results of comparisons with symbols >, =, or <, and justify the conclusions, e.g., by using a visual fraction model.
Explain why a fraction 𝘢/𝘣 is equivalent to a fraction (𝘯 × 𝘢)/(𝘯 × 𝘣) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to recognize and generate equivalent fractions.
Total Pages
25 pages
N/A
Teaching Duration
90 minutes
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