## Tuesday, December 04, 2012

### Fun with Factors and Multiples

Fourth graders have a new multiples and factors standard:

Gain familiarity with factors and multiples.
Standard 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.

To meet this standard my class is creating a bulletin board with multiple/factor cards.  Hopefully the exercise will create some great discussion, number exploration and vocabulary building.  Later we'll use our 100 Multiple/Factors bulletin board to inform our problem solving work.

Take a look if you're interested, and use this exercise with your students.  Let me know how it goes and if you added to it or made any revisions. Also, if you have some great multiple/factor problems or projects, please let me know.

Project Update
This project was terrific as it caused tremendous number talk and exploration.  All children completed cards for numbers 1-20, then we assigned specific numbers to individuals until we completed two bulletin boards with numbers 1-100.  We coded primes and composites, looked for patterns, identified squares and perfect numbers and will now use the board as a resource for problem solving and number talk.