Classifying quadrilaterals; mixed proofs
- The two lists — 3 tasks
- The word that makes it true — 3 tasks
- Every square is a rectangle — 3 tasks
- What the marks let you prove — 3 tasks
- Going Deeper — 6 tasks
- Practice — 23 tasks
- Summary — 2 tasks
- Cool-down — 3 tasks
Classroom activities
Things a class does rather than writes on. Each one is a finished PDF: print it, cut it up if it says so, and hand it round.
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Does the Name Fit the Marks? Classifying Quadrilaterals — Cut & Glue Sort 25 minutes, including the cutting · 5 sheets
12 marked quadrilaterals, each with a name, sorted into three rows: the most specific name the marks prove, a true name that is too general, and a name the marks do not prove. The pieces use the whole family: quadrilateral, trapezoid, kite, parallelogram, rectangle, rhombus and square. Shapes in the last row are drawn to look like their names on purpose.
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What Is the Most Specific Name? Classifying Quadrilaterals — Answer Maze 10–15 minutes · 4 sheets
8 boxes on one page, each a quadrilateral with ticks, arrowheads or right-angle marks. The student chooses the most specific name the marks prove. The wrong answers are the two big mistakes: a true name that is too general, and a name the drawing suggests but the marks do not prove. The row of box numbers at the foot is the check.
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Is It the Most Specific Name? Classifying Quadrilaterals — Mystery Picture 25–35 minutes · 4 sheets
25 squares, each a quadrilateral with ticks, arrowheads or right-angle marks and a name printed under it: fill the square only if the name is the most specific name the marks prove. Names that are true but too general, and names the marks do not prove, stay white. Some shapes are drawn to look more special than their marks. When every square is right, a picture appears.