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. This is a hand-picked selection of our math games that focus specifically on addition. If you would like, you can create an account to save your progress. Or if you already have an account, you can log in.

1.
Find a Pair of 6's
3.
Find Any Pair Greater Than 100
4.
Find Any Triplet Using At Least 6 Cards
5.
Find a Triplet of 7's Using At Least 7 Cards
7.
Find Any Triplet of Fractions
10.
Find 9 Different Pairs Using Exactly 3 Cards Each
11.
Find 4 Different Triplets
12.
Find a Pair of 100's
17.
Find a Quadruplet of 1's
18.
Find Any Pair Using At Least 3 Square Roots
19.
Find Any Pair Using the 6, 27, and 74 Cards
20.
Find a Pair of 2/3's
21.
Find 10 Different Quadruplets Less Than 10
24.
Find Any Pair Greater Than 0 Using Exactly 8 Cards
25.
Find a Pair of 44's
28.
Find Any Triplet Greater Than 100
30.
Find Any Pair Greater Than 0 Using All 9 Cards
33.
Find a Pair of 27's
35.
Find 7 Different Pairs Greater Than 15 Using Only Addition
38.
Find 14 Different Pairs Greater Than 0 Using Exactly 3 Cards Each