Lesson 3

Add, Subtract, and Multiply with Fraction Strips

Est. Class Sessions: 2
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Mathematical Standards

4.NF.B
Build fractions from unit fractions. (4.NF.B.3, 4.NF.B.4)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in solving them.
MP2.
Reason quantitatively.
MP3.
Construct viable arguments and critique the reasoning of others.
MP4.
Model with mathematics.
MP5.
Use appropriate tools strategically.

Students use their fraction strips from Lessons 1 and 2 to add, subtract, and multiply fractions with like denominators. Students look for patterns in number sentences to solve a problem that cannot be represented with the fraction strips.

Content in this Lesson

  • Writing number sentences from area models of fractions [E6].
  • Adding and subtracting fractions with like denominators using fraction strips [E10].
  • Multiplying fractions by a whole number [E11].
  • Naming and representing fractions greater than one [E5].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide

Teacher Resources

 Teacher Guide - digital

Supplies for Students

set of fraction strips from Lessons 1 and 2

Materials for the Teacher

Fraction Strips for the Teacher and More Fraction Strips for the Teacher Masters (Teacher Guide)
         from Lessons 1 and 2, 1 set of cut strips, folded, colored, and labeled
Unit 8 Assessment Record
Math Facts Class Record
chart paper, optional

Materials Preparation

Student Display Space. Prepare a sheet of chart paper or a large section of the board to record the addition and subtraction number sentences students use to solve the problems in this lesson. The space should be visible by all students and be large enough to record about fifteen number sentences.

Assessment in this Lesson

Assessment Expectation Assessed

Add, Subtract, and Multiply with Fraction Strips
Check-In: Questions 8–11
Student Guide
Page 311
E5.
Name and represent fractions greater than one as mixed numbers and improper fractions using models (fraction strips, circle pieces, number lines).
E10.
Add and subtract fractions with like denominators using area models.

Add, Subtract, and Multiply with Fraction Strips
Check-In: Question 19
Student Guide
Page 313
E5.
Name and represent fractions greater than one as mixed numbers and improper fractions using models (fraction strips, circle pieces, number lines).
E6.
Write number sentences from area models of fractions
(e.g., 1/2 = 3/6, 1/3 + 1/3 = 2/3, 1/3 + 1/3 + 1/3 = 1/3 × 3).
E11.
Multiply fractions by a whole number
(e.g., 1/3 × 3 = 1, 2/3 × 6 = 1/3 × 6 × 2).

DPP Item I
Words to Numbers
Teacher Guide - digital
E2.
Use words and numbers to name fractions.