Interpretation of Multiplication by Scaling

Subject: Math, Operations and Algebraic Thinking

Type: Lesson Plan Bundle

Skills:

• Compare the size of a product to the size of one factor on the basis of the size of the other factor without performing the indicated multiplication
•  Explain why multiplying a given number by a fraction greater than 1 results in a product greater than the given number (recognizing multiplication by whole numbers greater than 1 as a familiar case)
• Practice sharing how and why multiplying a given number by a fraction less than 1 results in a product smaller than the given number
• Relate the principle of fraction equivalence a/b = (n × a)/(n b) to the effect of multiplying a/b by 1
• Complete an "exit ticket" to help drive your next instructional steps

Materials Needed:

• Blank paper
• Pencils
• Index cards (3 per student) (or a whiteboard and dry erase markers per student)
• Document camera or whiteboard, computer with projector

Printable Resources:

• Student Resources:
  • “Exit Slips” (1 copy per student)
  • “Tricky Multiplication Sentences” (1 copy per student)

CCSS: 5.NF.5, MP2, MP4, MP8