The Proof! tabletop card game is the inspiration behind our free, online Math Puzzle Challenges. Each carefully constructed puzzle consists of a set of nine cards that hides a challenging equation. If you would like, you can create an account to save your progress. Or if you already have an account, you can log in.

301.
Find A Pair of 1331's
302.
Find a Triplet of 3's Using Exactly 3 Cards
303.
Find 2 Different Pairs Using Only Division
304.
Find a Triplet of -1/4's
305.
Find 11 Different Pairs Using Exactly 3 Cards Each
306.
Find a Pair of 8's Using At Least 8 Cards
307.
Find 2 Different Pairs Using Only Multiplication
308.
Find 4 Different Fraction Pairs
309.
Find a Pair of -25's Using Only Subtraction and Division
310.
Find a Pair of 2/7's
311.
Find 5 Different Pairs Using Only Addition
312.
Find Any Pair Greater Than 100 Using Only Division
313.
Find a Pair of 2024's

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