Lesson 2

Sifting for Primes

Est. Class Sessions: 1–2
X

Mathematical Standards

5.NF.A
Use equivalent fractions as a strategy to add and subtract fractions. (5.NF.A.1)
5.OA.B
Analyze patterns and relationships. (5.OA.B.3)

Standards for Mathematical Practice

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 use of structure.
MP8.
Look for and express regularity in repeated reasoning.

Students identify the prime numbers between 1 and 200 using the Sieve of Eratosthenes. Students look for patterns that develop on the 200 Chart as primes are identified.

Content in this Lesson

  • Identifying prime numbers [E1].
  • Identifying and finding multiples of numbers [E2].
  • Identifying and describing number patterns [E3].
  • Finding all the factors of a number for numbers between 1 and 100 [E5].

Daily Practice and Problems E–F

E. Order Decimals

F. Practice

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

  • calculators
  • self-adhesive notes

Materials for the Teacher

Assessment in this Lesson

Assessment Expectation Assessed

Sifting for Primes
Check-In:
Questions 8–10
Student Guide
Page 431
with corresponding
Feedback Box
Teacher Guide - digital
E1.
Identify and categorize prime, composite, and square numbers.
E2.
Identify and find multiples of numbers.
E5.
Find all the factors of a number for numbers between 1 and 100.