Lesson 2

Divisibility Rules

Est. Class Sessions: 2
X

Mathematical Standards

4.OA.B
Gain familiarity with factors and multiples. (4.OA.B.4)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in solving them.
MP2.
Reason quantitatively.
MP6.
Attend to precision.
MP7.
Look for and make use of structure.

Students explore ways to determine whether a multidigit number is divisible by 2, 3, 5, 6, 9, or 10. Being able to tell whether a number is divisible by a given number will help students choose convenient numbers in later computations with division.

Content in this Lesson

  • Identifying and describing patterns in the multiples of 2, 3, 5, 6, 9, and 10 [E1].
  • Exploring the inverse relationship between multiplication and division [E1].
  • Determining whether a number is divisible by 2, 3, 5, 6, 9, or 10 [E1].
  • Developing number sense.
  • Using divisibility rules to identify factors and multiples [E1].
X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

blue and red crayons or colored pencils calculator

Supplies for Student Pairs or Groups

materials for students to display and share work

Materials for the Teacher

Display of 100 Chart Master (Teacher Guide)
Display of Math Practices (Student Guide) Reference
Unit 7 Assessment Record
blue and red markers
chart paper, optional

Materials Preparation

Display Space for the Divisibility Rules. Create a bulletin board or display space to collect the divisibility rules. As students explore the multiples of 2, 3, 5, 6, 9, and 10 add rules for identifying each. Students may use the display as reference.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed

Divisibility Rules
Question 23
Student Guide
Page 262
MPE1.
Know the problem. I read the problem carefully. I know the questions to answer and what information is important.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.

Divisibility Rules
Check-In: Question 24
Student Guide
Page 262
E1.
Use divisibility rules to identify factors and multiples.