Lesson 7

A Different Sieve

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Challenge

Challenge T can be used as a Problem of the Week.

  1. 3

  2. 308, 319
  3. 307, 311, 313, 317



  4. 24 × 19

T. Prime and Composite Numbers

Use your calculator as needed to solve each problem.

  1. Cross out all the numbers between 301 and 320 that have 7 as one of their factors. How many numbers did you find?
  2. Two numbers between 301 and 320 have 11 as one of their factors. Which two numbers are they?
  3. Use what you have learned about finding prime numbers to find all of the prime numbers between 301 and 320.
  4. Draw a factor tree for 304. Then write its prime factorization.