Grade
4
Same & Different: Using Arrays to Multiply
Look at the two pictures. What do you notice?
![A. shows a rectangle with 4 parts as a model for multiplication. The top left part is 20 times 10. The top right part is 20 times 6. The bottom left part is 4 times 10. The bottom right part is 4 times 6. B. shows a rectangle with 2 parts as a model for multiplication. The vertical side length is 10 for one part and 6 for the other part. The horizontal side length is 24.](/sites/default/files/styles/large/public/inline-images/mRdjklRcK2WXy6wpvFbnFChFmzvl2RVmKdAqqlU7lLeCmH6mRs.png?itok=7eCHEvO4)
- How are pictures A and B mathematically the same, and how are they different?
- A and B are the same because …
- A and B are different because …
- Make a third figure with the dimensions labeled. Explain how your picture is the same as pictures A and B, and how it is different.
Printable Version
Google doc for printing and copying
Reference for Educators
Sample problems and solutions