Lots of squares

Student Activity

How many squares can you find that have dots from this array as their corners?

5x5dots.

Specific Learning Outcomes
Describe the properties of a square
Work systematically when problem solving
Devise and use problem solving strategies (act it out, draw a picture)
Use equipment appropriately
Description of Mathematics

This problem explores the concept of "squareness". It reinforces the understanding that a square has 4 equal sides and 4 right angles. The students need to recognise that a square is not always  dotsSquare.
but may be dotsSquare2.

Required Resource Materials
Copymasters of dot papers

Copymaster of the problem (Māori)

Copymaster of problem (English)

4x4 geoboards or 4x4 dot paper

Activity

Problem

How many squares can you find that have dots from this array as their corners?

5x5dots.

Teaching sequence

  1. Introduce the problem as a "treasure hunt". How many squares can be made on this board (or grid)? Let the search begin!
  2. Ask the students, in pairs, to make a square on the geoboard with a rubberband (or draw one on the dot paper). It can be any size and in any location.
  3. Share the squares found by the class. Notice whether the squares displayed are different by size, location or both.
  4. Pose the problem: How many squares do you think that you can find?
  5. As the students work ask:
    How do you know when something is a square?
    What did you find out during this activity?
    Are you organising your search for the squares? How?
  6. Share answers. If there are different answers look at why this is so. Get the students to share the ways that they organised their search.

Extension

Squares in a 5x5 geoboard or copymaster 5 x 5 dot paper 

Other contexts for the problem

Solution

18 squares

Size of squareNumber
1x19
2x24
3x31
tilted (one dot enclosed)4
tilted (4 dots enclosed)2

Some students may notice that there is a pattern in the number of the non-tilted squares (1, 22, 32)

Solution:

squareans


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