ALEX Lesson Plan

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This lesson provided by:
 Author: Sherry Williams System: Covington County School: Fleeta School
General Lesson Information
 Lesson Plan ID: 13223 Title: Adding and Subtracting Mixed Numbers Overview/Annotation: During this technology based lesson, students learn how to add and subtract mixed numbers by exploring websites on the Internet. Students demonstrate their knowledge of fractions by participating in practice activities on the Internet.
Associated Standards and Objectives
Content Standard(s):
 TC2 (3-5) 8. Collect information from a variety of digital sources. Examples: online libraries, multimedia dictionaries Using technology tools to organize information Demonstrating efficient Internet search strategies Example: keyword search Evaluating electronic resources for reliability based on publication date, bias, accuracy, and source credibility TC2 (3-5) 9. Use technology tools to organize, interpret, and display data. Examples: spreadsheets, databases, electronic graphing tools MA2015 (4) 14. Understand a fraction a/b with a > 1 as a sum of fractions 1/b. [4-NF3] a. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. [4-NF3a] b. Decompose a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions, e.g., by using a visual fraction model. [4-NF3b] Examples: 3/8 = 1/8 + 1/8 + 1/8; 3/8 = 1/8 + 2/8; 2 1/8 = 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8. c. Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction. [4-NF3c] d. 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. [4-NF3d] MA2015 (5) 11. 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. [5-NF1] Example: 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.) MA2015 (5) 12. Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally, and assess the reasonableness of answers. [5-NF2] Example: Recognize an incorrect result 2/5 + 1/2 = 3/7 by observing that 3/7 < 1/2. MA2015 (5) 16. Solve real-world problems involving multiplication of fractions and mixed numbers, e.g., by using visual fraction models or equations to represent the problem. [5-NF6]

Local/National Standards:

Primary Learning Objective(s):

Students will add and subtract mixed numbers. Students will write fractions in simplest form.

Preparation Information
 Total Duration: 61 to 90 Minutes Materials and Resources: None Technology Resources Needed: Computers with Internet access, LCD projector Background/Preparation: Students must have a basic understanding of fractions and mixed numbers.
Procedures/Activities: