Number Thumber: Mental Math
The mental arithmetic workout
About
Sharpen your mental math skills with this engaging game. Fill in missing digits in arithmetic expressions within a time limit. Customize problem types and operations to create a personalized learning experience.
What's New in Number Thumber
2.06.00
April 28, 2026
Added support for the trial versions.
Subscriptions & In-App Purchases
Number Thumber monthly
Number Thumber monthly recurring subscription
FAQ
How does Number Thumber work?
Number Thumber presents arithmetic expressions with missing digits. Players tap or slide controls to input the correct numbers within a time limit to solve the problems.
What types of math problems are available in Number Thumber?
The game supports single-step addition, subtraction, multiplication, and division. It also includes options for fractions and negative terms, allowing for more complex calculations.
Can I customize the difficulty of Number Thumber?
Yes, you can customize the types of problems, including which operations are included. You can also configure settings for fractions and negative terms to adjust the challenge.
How is progress tracked in Number Thumber?
Each problem is timed, and a progress bar indicates the remaining time. Correct solutions are auto-recognized, and a score is displayed, with the time allocated for solving problems increasing with the score.
What devices is Number Thumber compatible with?
Number Thumber is available on Mac, iPhone, iPad, and iPod, making it accessible across various Apple devices.
Does Number Thumber have ads?
No, Number Thumber does not contain advertisements, providing an uninterrupted learning experience.
What is the subscription model for Number Thumber?
Number Thumber offers a monthly subscription plan for $0.99, providing access to premium features or content.
How often is Number Thumber updated?
The latest version of Number Thumber is 2.06.00, and it was last updated on April 28, 2026, indicating regular maintenance and potential feature additions.
