Lesson Plan

Factors Over the Rainbow

Make math colorful! Teach your students to find the factors of a number using the factor rainbow strategy.
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Need extra help for EL students? Try the Factor Friend or Foe? pre-lesson.
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Need extra help for EL students? Try the Factor Friend or Foe? pre-lesson.

Learning Objectives

Students will be able to find all factor pairs for a given number.

The adjustment to the whole group lesson is a modification to differentiate for children who are English learners.
EL adjustments

Introduction

(5 minutes)
Factor RainbowsGreatest Common Factors
  • Write the number 12 on the board.
  • Ask students to shout out factors (i.e., "What numbers go into 12?").
  • Write the factors around the number and prompt students as needed to get all factors (1, 2, 3, 4, 6, 12).
  • Explain, "These are all factors of 12. Factors are numbers we can multiply together to get another number. For example, 3 x 4 is 12, so 3 and 4 are both factors of 12."
  • Write the definition of "factor" on the board (a whole number that divides exactly into another number).

Beginning

  • Give students thinking time to discuss the factors of 12 with a partner before shouting them out as a whole group.

Intermediate

  • Include the meaning of "factor" in students' home language (L1) as applicable.
  • Display examples of factors to help solidify understanding.