Multiplication Strategies on Ungridded Rectangles
The purpose of this lesson is for students to represent multiplication strategies on an ungridded rectangle.
Previously, students used gridded rectangles to represent strategies based on the distributive and associative properties. Here, they use the same strategies, but represent them on an area diagram without a grid. Then, students match expressions that could represent the area of the same rectangle, without using diagrams. The reasoning helps students work toward fluent multiplication within 100.
- Apply associative and distributive properties of multiplication to find products within 100.
- Recognize that multiplication is associative and can be distributed over addition.
- Let’s use different strategies to find the area of ungridded rectangles.
Materials to Copy
- Centimeter Grid Paper - Standard
- Card Sort: Different Expressions, Same Rectangle
- Create a set of cards from the blackline master for each group of 2 or 4.
|Activity 1||15 min|
|Activity 2||20 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
Which students came up with an unexpected strategy in today’s lesson? What are some ways you can be more open to the ideas of each and every student?
- Rectangle Rumble (3–5), Stage 3: Factors 1–10 (Addressing)
- Capture Squares (1–3), Stage 7: Multiply with 6–9 (Addressing)
Print Formatted Materials
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|Student Task Statements||docx|
|Lesson Cover Page||docx|
|Cool Down||Log In|
|Teacher Guide||Log In|
|Teacher Presentation Materials||docx|