Lesson plan

Determine the numbers from 1-100 that are prime using area models or t-charts

teaches Common Core State Standards CCSS.Math.Content.4.OA.B.4 http://corestandards.org/Math/Content/4/OA/B/4

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Big Ideas: All whole numbers greater than 1 are either prime or composite. Determining the factor pairs of a number helps identify whether the number is prime or composite. This lesson teaches the students about prime numbers. By the end of the lesson, the students should know how the number of factor pairs a whole number has tells us if the number is prime or composite. They also need to know that all prime numbers are odd, but not all odd numbers are prime. The only exception to the rule is the number 2, which prime because it only has one factor pair. Vocabulary: prime number, composite number, factors, multiplication , division, divisible Special Materials: grid paper two-sided counters