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.

261.
Find a Pair of 2023's
262.
Find a Triplet of 1/6's
263.
Find Any Pair Using Only Division
264.
Find 6 Different Pairs
265.
Find a Pair of 100's Without Using Multiplication
266.
Find a Triplet of 1/2's
267.
Find Any Pair Using All 9 Cards and No Subtraction, Multiplication, or Division
268.
Find Any Triplet Less Than 0
269.
Find a Pair of 10's
270.
Find a Pair of -5's Using Only Subtraction and Division
271.
Find 3 Different Fraction Pairs
272.
Find Any Pair Using Division At Least 3 Times
273.
Find a Pair of 4096's
274.
Find Any Pair Greater Than 0 Using Only Subtraction
275.
Find a Pair of 9/10's
276.
Find Any Triplet Greater Than 5
277.
Find 4 Different Pairs Greater Than 100
278.
Find Any Quintuplet Less Than 100
279.
Find Any Fraction Triplet
280.
Find 3 Different Pairs Greater Than 25 Using Exactly 4 Cards Each