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.

41.
Find a Pair of 10000's
42.
Find 5 Different Quintuplets Greater Than 0
43.
Find Any Pair Less Than 100 Using All 9 Cards and No Square Roots
44.
Find Any Pair Using Addition At Least 4 Times
45.
Find 5 Different Pairs Greater Than 50 Using the 98, 64, and 16
46.
Find a Quadruplet of 5/7's
47.
Find Any Pair Greater Than 0 Using All 9 Cards
48.
Find 15 Different Pairs Greater Than 100
49.
Find Any Pair Using Subtraction At Least 6 Times
50.
Find 2 Different Triplets Greater Than 10
51.
Find a Pair of 1's Using Only Division and Addition
52.
Find 7 Different Pairs of Fractions Less Than 1
53.
Find a Pair of 2019's
54.
Find Any Pair
55.
Find Any Pair Using All 9 Cards and Only Addition and Multiplication
56.
Find Any Quintuplet
57.
Find a Triplet of -1/2's
58.
Find Any Pair Greater Than 100 Using Only Subtraction
59.
Find a Pair of 0's Using All 9 Cards
60.
Find Any Triplet Using At Least 8 Square Roots and No Addition or Subtraction