https://store.steampowered.com/app/860390/Math_Speed_Challenge/
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STEAM KEY REGION FREE GLOBAL

Challenge your equation solving speed in this fast paced math game. Each round consists of three math problems: addition, subtraction, multiplication. You must select the correct answer in the limited amount of time that would correctly answer the equation. You can track the number of right and wrong answers by count and by assigned letter grades that change as you progress. Select from multiple difficulty settings and restart at anytime to clear your progress and try to achieve 100%. With endless levels, randomized math equations, multiple difficulty settings, and an easy to use interface Math Speed Challenge will provide hours of challenges.

Features:
Endless Rounds
3 Problems Per Round
Addition, Subtraction, and Multiplication Equations
Multiple Difficulty Settings
Random Math Equations

Activation Instructions:

1. You need to download and install Steam http://steampowered.com/download/SteamInstall.msi
2. Go to your account or register a new one.
3. Go to the "My Games" and select "Activate via Steam ...", and enter the key received after payment.
4. Once activated, the game will appear in the game list (Library) and you can download it