Proof!

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The Fast Paced Game of Mental Math Magic

Award-winning and delightfully addicting, Proof! is the equation hunting card game that's good for your brain too! A long-time favorite of teachers, it's loved by kids, families, and grownups alike.

9+

2-6

15m

Made in
the USA

Teacher's Choice Gold award winner

Selected by teachers for "exceptional quality and outstanding performance in the classroom and at home!"

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Improve mental math skills

Adaptable rules for younger players and solo play, too. Practice multiplication, division, addition, subtraction, and square roots.

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Play our free online math game, too

New math puzzles inspired by Proof! posted every Monday. A popular activity to challenge math lovers in the classroom or at home.

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How to play Proof!

1. Make an equation

Quick! Find an equation among the nine number cards on the table.

2. Shout the result

Once you've got one, shout the result before anyone else!

3. Show your proof

Tell everyone the proof. If your math adds up, keep the cards you used.

4. Keep the cards

Deal more and keep going. When the deck runs out, the player with the most cards wins!

Example equations

After placing 9 cards face up on the table, try to find equations using at least 3 of the 9 cards and any combination of +, -, x, ÷, and √ (square roots).

For example, below are some equations you could make with the cards shown at left. above. Remember to shout the answer first then show your work.

Award-winning, teacher approved!

Teachers' Choice Award

Selected by teachers who evaluate various educational games and tools, winners are products of "exceptional quality and outstanding performance in the classroom and at home!"

Academics' Choice Brain Toy Award

Selected by an academic board, winners provide "robust educational value" with "innovative and unique" products. Testers raved, "From the interesting, bright packaging to the detailed rules of play, this game was not only educational, but FUN."

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Parent's Choice Award

The selection process "screens for originality of design and purpose, long-term learning value, long-term play value, fair market value, and fun" and "winners attest to the power of learning through play."

Creative Child's Game of the Year Award

Evaluators raved, "Proof! is an excellent card game," "Kids will love playing Proof! and it will sharpen their math skills," and "This is such a fun game to play with the whole family. It will really get your mind working and the pace is fast."

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Mensa Mind Games Participant

Proof! participated in the 2018 Mensa Mind Games competition, and many of its brainy members gave it top marks saying, "LOVE this game", "Fast moving and different", and "A real thinking person's game!"

What's in the box

100 high-quality number cards chosen for optimal fun. Made in the USA.

More lower numbers like 0 - 10, and fewer trickier numbers, like 85 and 97.

Full instructions with example equations. Translations available online.

Suggested modifications to accommodate all ages and math levels.

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