Lesson 6

Division in Lizardland

Est. Class Sessions: 2
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Mathematical Standards

3.OA.A
Represent and solve problems involving multiplication and division. (3.OA.A.1, 3.OA.A.2, 3.OA.A.3)
3.OA.B
Understand properties of multiplication and the relationship between multiplication and division. (3.OA.B.5)
3.OA.C
Multiply and divide within 100. (3.OA.C.7)

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.
MP6.
Attend to precision.
MP7.
Look for and make sense of structure.

Students solve problems about the Lizardland Amusement Park involving division. They look at the relationship between multiplication and division and discover there is no turn-around rule for division. They also investigate division involving zero.

Content in this Lesson

  • Representing division problems with number sentences and drawings [E1].
  • Using strategies to solve division problems such as repeated subtraction, using related multiplication facts, using counters, or drawings [E2, MPE1, MPE2].
  • Representing an answer so someone else can understand one's thinking [MPE5].
  • Using labels to explain solutions and strategies [MPE6].
  • Investigating division involving zero.
  • Investigating whether there is a turn-around rule for division.
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide

Teacher Resources

 Teacher Guide - digital
  • Triangle Flash Cards: 5s and 10s

Supplies for Students

counters
My Multiplication Table from Lessons 3–5 (Student Activity Book) Page 261

Materials for the Teacher

Display of Math Practices (Student Guide) Reference
Large Triangle Flash Card Master (Teacher Guide)
Unit 8 Assessment Record
Math Facts Class Record

Materials Preparation

Triangle Flash Cards. The Triangle Flash Cards: 5s and 10s were prepared and distributed in Lesson 5. If needed, prepare copies on heavier paper or card stock. Have students cut apart each set and store them in an envelope. Provide each student with two sets, one for school and one for home.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed

Division in Lizardland
Check-In: Question 7
Student Guide
Page 208
with corresponding Feedback Box
Teacher Guide - digital
E1.
Represent multiplication and division problems with number lines, drawings, rectangular arrays, and number sentences.
E2.
Use strategies to solve multiplication and division problems (e.g., skip counting, repeated addition, repeated subtraction, reasoning from known facts, and invented).
MPE1.
Know the problem. I read the problem carefully. I know the questions to answer and what information is important.
MPE2.
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
MPE6.
Use labels. I use labels to show what numbers mean.

DPP Item S
Fact Families: Groups 7 and 8
Teacher Guide - digital
E11.
Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Groups 5–8.