Lesson 3

Factors

Est. Class Sessions: 2–3
X

Mathematical Standards

4.NBT.B
Use place value understanding and properties of operations to perform multi-digit arithmetic. (4.NBT.B.5, 4.NBT.B.6)
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 abstractly and quantitatively.
MP8.
Look for and express regularity in repeated reasoning.

Students use rectangular arrays to discuss factors, including a way to find factors using a calculator. They find factors of several numbers and investigate prime numbers. They use number lines to make connections between factors and multiples.

Content in this Lesson

  • Finding all the factors of a number using rectangular arrays and calculators [E3].
  • Identifying prime and square numbers [E4, E5].
  • Using a number line to show multiples of a number [E2].
  • Representing and solving multiplication and division problems using rectangular arrays [E1].
  • Making connections between factors and multiples.

Daily Practice and Problems I–L

I. Factors

J. Nickels

K. Tine Goes By

L. Baseball Cards

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
  • Factors
    Homework section
    Pages 82–83
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Groups

50 square-inch tiles per group (3–4 students)
calculators

Materials for the Teacher

completed rectangles class chart from Multiplication and Rectangles (Lesson 1)
Display of Square-Inch Grid Paper (Lesson 1 Teacher Guide)
Unit 3 Assessment Record

Assessment in this Lesson

Assessment Expectation Assessed
How Many Rectangles with 20 Tiles?
Assessment Master with Feedback Box
E1.
Represent and solve multiplication and division problems using rectangular arrays.
E2.
Determine whether one number is a multiple of another number.
E3.
Find the factors of a number.