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A cuboid is made from cubes of equal size, coloured alternately white and black as shown.
What fraction of the surface area of the cuboid is coloured black?
If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.
Chequered Cuboid
Age 11 to 14
ShortChallenge Level 
A cuboid is made from cubes of equal size, coloured alternately white and black as shown.What fraction of the surface area of the cuboid is coloured black?
If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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