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Subject

Math, Science & Technology

Website

TeacherLED: Prime Factor Tree - http://www.teacherled.com/2008/09/15/prime-factor-tree/

Content Provider

TeacherLED is a website that provides interactive whiteboard resources for educators.

Description

Prime Factor Tree is an interactive whiteboard resource to use for demonstration or questioning purposes with a class.  Select a number from 2 to 99.  Clicking "Go" will generate a prime factor tree for that number.  The numbers will be obscured by leaves which can be removed by clicking on the leaf.  This allows discussion on what the numbers will be before they are revealed.

Once all of the leaves are removed the prime factors can be pointed out.

Related Academic Standards

New York State

3.NBT.3 Multiply one-digit whole numbers by multiples of 10 in the range 10-90 (e.g., 9 x 80, 5 x 60) using strategies based on place value and properties of operations.

4.OA.4 Find all factor pairs for a whole number in the range 1-100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1-100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1-100 is prime or composite.

5.NBT.5 Fluently multiply multi-digit whole numbers using the standard algorithm.

6.NS.4 Find the greatest common factor of two whole numbers less than or equal to 100 and the least common multiple of two whole numbers less than or equal to 12. Use the distributive property to express a sum of two whole numbers 1-100 with a common factor as a multiple of a sum of two whole numbers with no common factor. For example, express 36 + 8 as 4 (9 + 2).

MST3.3.N.19 Students develop fluency with single-digit multiplication facts.

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