Can you solve the Four Fours Challenge?

The number four is traditionally associated with strength. You're going to need plenty of mental strength to solve this puzzler. Can you generate the numbers 0-20 using only four fours? It's harder than you think! This brain-bending problem has been keeping mathematicians busy for decades.

Theme music
"Success Resolution Video Game Fanfare Sound Effect" by FunWithSound
Licensed under Attribution 3.0 Unported (CC BY 3.0).

Colour Palette
"Photoshop Swatches Library for Flat UI Design" by Alex Kolpikov

Recommended for Year 4, Year 5, Year 6, Year 7 and Year 8 students.
Recommended for Grade 4, Grade 5, Grade 6, Grade 7 and Grade 8 students.

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