Unit 7, Lesson 18
Using Common Multiples and Common Factors
Grade 6
Preparation
Lesson Narrative
In this lesson, students apply what they have learned about factors and multiples to solve a variety of problems. Students make sense of problems by determining whether they involve finding factors or multiples before working with a partner to solve them (MP1).
One optional activity allows students to go beyond the standards addressed at this level by exploring common factors and common multiples of three whole numbers. A second optional activity gives students an opportunity for additional practice finding multiples and factors in a game-like setting.
- Choose to calculate the greatest common factor or least common multiple to solve a problem about a real-world situation, and justify (orally) the choice.
- Present (orally, in writing, and using other representations) the solution method for a problem involving greatest common factor or least common multiple.
Let’s use common factors and common multiples to solve problems.
Required Preparation
Preview the calling cards and decide if students are familiar with all the vocabulary used in the statements. Some of the words may need to be reviewed ahead of time.