Mental Math Test
How many problems can you solve in your head in 60 seconds? Try addition, subtraction, multiplication, division, and percentages, with difficulty that increases as you go.
You have 60 seconds para resolver o máximo de contas de cabeça. Começa com somas simples; a cada 4 acertos vêm tabuada, divisão, contas de dois algarismos e porcentagem.
Time's up!
0 problems
Processed on your device. Nothing you type is sent anywhere.
How to use: Mental Math Test
- Click Start to begin. The 60-second timer starts with the first problem.
- Enter your answer and press Enter. The problems get harder every 4 correct answers. Stuck? Click Skip.
- When time runs out, see how many problems you got right and wrong, then share your score.
About this tool
How the difficulty increases
Problems are generated on the fly, so they never repeat in the same order. You’ll start with addition and subtraction up to 20. After 4 correct answers, you’ll get multiplication tables and division problems that divide evenly, followed by two-digit addition and subtraction. Next come problems like 37 × 6 and 168 ÷ 7. At the final level, you’ll see percentages ("25% of 340") and multiplication problems like 14 × 17.
Wrong answers don’t cost you points, but they won’t advance you to the next level either—and each mistake appears in your final score. Your shared result shows only your correct and incorrect answers.
Mental math tips
- Add in parts: 47 + 38 = 47 + 30 + 8 = 85.
- Multiply in parts: 37 × 6 = 30 × 6 + 7 × 6 = 180 + 42 = 222.
- Percentages: 10% means divide by 10; 25% means divide by 4; 75% is 3 times 25%.
Prefer everyday problems, like making change and proportions? Try the everyday math test.
Frequently asked questions
What’s a good score in 1 minute?
It depends on the difficulty level, but more than 18 correct answers is a great score. It means you made it past multiplication tables and reached two-digit problems.
Can I use a calculator or paper?
You can, but that takes the fun out of it: the goal is to practice mental math. The shared score is for friendly competition, not a formal test.
Will negative answers appear?
No. Subtraction problems always put the larger number first, and division problems always divide evenly, so all answers are positive whole numbers.
Is it really free? Is there a daily limit?
It's free with no daily limits. Processing happens on your device, so there's no per-use cost and no need to limit you.
Does it work on phones?
Yes. The site works in any modern browser on Android, iPhone, Windows, Mac, and Linux—no installation needed.
Related tools
Attention Test
Find the odd symbol in 20 grids that grow from 4×4 to 7×7. Race the clock and see your accuracy and speed.
Percentage Calculator
Find X% of Y, calculate increases, discounts, and percentage changes.
Microphone test
Check if your microphone is working with a live audio level, a 5-second recording, and troubleshooting tips.
Reaction Time Test
Click as soon as the screen turns green. See your average time across 5 attempts in milliseconds, with early clicks detected.
Memory Test
Memorize sequences of numbers or colors that get longer with each correct answer and find out how many items you can remember.
Internet Speed Test
Measure download and upload speeds, ping, and jitter between your device and our server—no installation required.
Color Blindness Test
Read the numbers hidden in 10 color-dot plates and find out if you should consider getting a color vision exam.
Number Memory Test
Digit span: repeat number sequences in the order they appear, then backward, and see how many you can remember.