SHAKER HIGH SCHOOL
Model Lesson/ Best Practices to Share			Sieve of Eratosthenes
Subject	Math		Grades	7-12
NY State Standards		5.N.12: Recognize that some numbers are divisible by one and themselves (prime) and others have multiple divisors (composite) 5.N.13: Calculate multiples of a whole number
Instructional Focus		Visualizing patterns created by multiples on the hundreds chart.
Performance Task		1. Have students identify the multiples of 2,3,5 and 7. When crossing out the multiples students should realize that these are composite numbers. 2. Have students identify the numbers remaining as prime.
Scoring Guide		Students will be successful in identifying multiples of 2,3,5,7, if they have the same 25 prime numbers remaining on the chart as the teacher does on the screen.
Essential Skills		Students must understand the terminology of prime, composite, neither and multiples. They must also be able to compute the multiples of the various numbers using addition, multiplication or through the use of patterns.
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