It says it comes with “100 number cards chosen for optimal fun.” So does that mean it’s just 0-99? Or are some numbers missing or doubled?

Hello! For "optimal fun", we've chosen our 100 number cards so that there are more of the easier-to-use lower numbers, such as 0 - 10, and we also removed some of the more difficult-to-use larger numbers, like 85. We've also left out many tricky prime numbers, like 97. We've found that doing this makes for a better mental math experience!

Is there always a “solution” on the “board” or are there times when everyone is stumped and you need to re-deal some cards?

Given the huge number of ways that equations can be made, there is almost always a solution somewhere on the board, and it's usually a pretty straightforward one. However, if for any reason players are stumped and can't spot the equation, the rules stipulate that you can deal 3 more cards to the center of the table. With 12 cards instead of 9 now on the board, it's incredibly unlikely there wouldn't be an equation somewhere in there.

Is it possible to play with just addition and subtraction, or do my kids have to be familiar with all the operations?

Hi! It’s definitely possible to play that way. I would also just recommend that you remove all cards over 30 from the deck so that it’s easier and more likely to be able to make equations with just addition and subtraction.

Would this math game be good for Freshmen in Highschool?

Yes. This game is great for any age group. You just customize for age.

Desertcart Logo

Deliver to SINGAPORE

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

Description

🧩 Master math magic in minutes—don’t miss out on the game everyone’s talking about!

BRAIN BOOSTING FUN - Sharpen multiplication, division, addition, subtraction, and square root skills while having a blast.
AWARD WINNING QUALITY - Teacher's Choice Gold Award winner—trusted by educators and parents alike.
LIGHTNING FAST GAMEPLAY - Keep the pace up with quick 15-minute rounds that fit any busy schedule.
FAMILY CLASSROOM READY - Perfect for 2-6 players, ages 9 to 109, with adaptable rules for all skill levels.
COMPACT TRAVEL FRIENDLY - Lightweight and portable—your go-to game for trips, commutes, or spontaneous game nights.

Proof! is a fast-paced, award-winning mental math card game designed for 2-6 players aged 9 to 109. Featuring 100 carefully selected number cards, it enhances core arithmetic skills including multiplication, division, addition, subtraction, and square roots. Compact and easy to learn, it’s perfect for family game nights, classrooms, or on-the-go fun.

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

S$95

Duties & taxes incl.

SINGAPOREstore

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

ChatGPT - opens in a new tab Perplexity - opens in a new tab Claude - opens in a new tab Grok - opens in a new tab Google AI - opens in a new tab

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

View all Trustpilot reviews

Educational Objective(s)	Improve mental math skills
Model Number	SZB-200
Number of Game Players	2-6
Assembly Required	No
Batteries Required	No
Batteries Included	No
Material Type(s)	Cardstock
Colour	Multicolor
Product Dimensions	13.97 x 9.91 x 2.54 cm; 200 g
Item model number	SZB-200
Manufacturer	Evermade
Country of Origin	USA
Item Weight	200 g

The Master Theorem Games Proof - Fast Paced Game of Mental Math Magic

Details

Description

Specifications

Have a Question? See What Others Asked

Common Questions