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.

241.
Find 10 Different Pairs Greater Than 0 Using Exactly 4 Cards Each
242.
Find Any Pair Less Than -20
243.
Find Any Pair Using Only Subtraction
244.
Find 5 Different Pairs Greater Than 35 Using Only Addition
245.
Find 7 Different Pairs Using Exactly 4 Cards Each
246.
Find 3 Different Triplets
247.
Find a Pair of 20's Only Using Division
248.
Find 8 Different Quadruplets
249.
Find a Pair of 5's Without Using Subtraction
250.
Find a Quadruplet of 3/7's
251.
Find Any Pair Greater Than 0 Using All 9 Cards
252.
Find 4 Different Pairs Greater Than 1
253.
Find 3 Different Pairs Greater Than 1000
254.
Find 8 Different Pairs Using Exactly 4 Cards Each
255.
Find Any Triplet Using At Least 10 Square Roots
256.
Find Any Triplet Greater Than 100
257.
Find a Pair of 50's
258.
Find a Triplet of 1/4's
259.
Find a Quadruplet of 1's
260.
Find 3 Different Triplets