Daily Maths Challenges

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Share your cool maths problems.

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Complete a challenge:

• Post your solution in comments, if it is exactly the same as OP's solution, let us know.
• Have fun.

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Post a challenge:

• Doesn't have to be original, as long as it is not a duplicate.
• Challenges not riddles, if the post is longer than 3 paragraphs, reconsider yourself.
• Optionally include solution in comments, let it be clear this is not a homework help forums.
• Tag [unsolved] if you don't have a solution yet.
• Please include images, if your question includes complex symbols, attach a render of the maths.

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Feel free to contribute to a series by DMing the OP, or start your own challenge series.

MODERATORS

(a+b)^2 = a^2+2*ab+b^2

(a-b)^2 = a^2-2*ab+b^2

(a+b)^2 = a^2 + 2*ab + b^2 = (a-b)^2 +4*ab = 4^2+4*1 = 16+4 = 20 ◽