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Unit 4 - Lesson 11 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 4
Lesson 11: Multiplication Strategies on Ungridded Rectangles
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 4
Lesson 11: Multiplication Strategies on Ungridded Rectangles
CC BY 2021 Illustrative Mathematics®
Lesson: Multiplication Strategies on Ungridded Rectangles

Which One Doesn’t Belong: Multiplication in Many Forms (Warm Up)

1.

Which one doesn’t belong?

Mark, then Express

For each rectangle:
  • Mark or shade each rectangle to show a strategy for finding its area.
  • Write one or more expressions that can represent how you find the area.
2.

Mark or shade the rectangle to show a strategy for finding its area.

3.

Write one or more expressions that can represent how you find the area.

4.

Mark or shade the rectangle to show a strategy for finding its area.

5.

Write one or more expressions that can represent how you find the area.

6.

Mark or shade the rectangle to show a strategy for finding its area.

7.

Write one or more expressions that can represent how you find the area.

Card Sort: Different Expressions, Same Rectangle

  • Your teacher will give you a set of cards with expressions that represent areas of rectangles.
  • Sort the expressions into groups so that the expressions in each group can represent the area of the same rectangle. Be prepared to explain your reasoning.
  • You can draw rectangles if you find them helpful.
8.

Explain your reasoning for sorting the cards.


Cool Down: Expressions for a Rectangle
9.

Mark or shade this rectangle to show a strategy for finding its area.

10.

Write one or more expressions that represent how you find the area.