Stage: 3 Challenge Level: 
Find a cuboid (with edges of whole number lengths) that has a
surface area of exactly $100$ square units.
Is there more than one?
Can you find them all?
Can you provide a convincing argument that you have found them all?
A poster of this problem is available here.
Generalising. Working systematically. Cuboids. Surface and surface area. smartphone. Interactivities. Factors and multiples. Workshop. Divisibility. Visualising.
Published October 2004.
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