Diffission Teacher Guide - Pre-Assessment


Time Required

60 Minutes


Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.





Bag with 8 square tiles


Prepare bags of square tiles to be given to each group of 3-4 students. Prior to the activity, make copies of the Rectangle Challenge Recording Sheet for each student, copy and cut sample rectangles, print Sentence Stems, and print the Rows and Columns Worksheet.

Rectangle Challenge

  • To start the Rectangle Challenge, divide students into small groups of three or four. Explain to the class that they will be participating in a timed challenge. Students will be expected to use the square tiles provided to create as many different rectangles as they are able to in 5 minutes. Students will also record and label each rectangle they create on their recording sheet. Students do not need to use all of their tiles for each rectangle.
  • Prior to the challenge, it’s important to emphasize the language to be used.

    • "We made a rectangle with ___rows of ___."
  • Before the activity begins, demonstrate the making and recording of one of the rectangles as an example.
  • Remember to distribute materials and set the timer for 5 minutes.
  • As students work, it’s a good idea to take pictures or record some of the rectangles created by the students.
  • After the timer expires, students may spend a couple more minutes recording their rectangles before coming to the group with what they discovered.
  • During the discussion period, students should share how many different rectangles they were able to create with the tiles provided.

Group Share: Describing Rectangles

As a large group, the class will discuss the rectangles created. Volunteers from each group will share some of the rectangles they made using the sentence stem provided.


As group members share the description of their rectangles, use the rectangles provided to display what students are describing on the large paper. Once each group has shared one or two rectangles, the groups will discuss how these rectangles would be described using the Sentence Stem, “We made a rectangle with ____ columns of ____.”

Note: If some students need to work on this skill a bit more before they move on, they could work on the following geoboard small group activity as a way to provide more practice.