1. Split the multiplication
38 × 7 − 24
HOW TO PLAY
30 seconds.
One answer at a time.
30s Math is a short mental arithmetic challenge, not an endless worksheet. Choose a level, wait through the three-step countdown, then solve as many generated questions as you can before the 30-second clock runs out. Each question has four choices. A wrong answer ends the run immediately, so the score rewards accuracy as well as pace.
What changes between levels
The levels change the numbers, operations, and number of steps. Questions are generated as you play, so examples below illustrate the actual question patterns rather than a fixed quiz.
| Level | Question patterns | Example |
|---|---|---|
| Easy | One-step addition or subtraction, small multiplication, and exact division. | 8 × 7 = 56 |
| Normal | Two-digit addition or subtraction, two-step arithmetic, squares, and square roots. | 15 × 5 + 10 = 85 |
| Hard | Larger multiplication, exact division, powers, and mixed two-step expressions. | 38 × 7 − 24 = 242 |
| Expert | Longer mixed calculations, evaluated derivatives, and definite integrals with integer results. | For f(x) = 3x² + 2x + 1, f′(2) = 14 |
Every question offers four distinct answer choices in a shuffled order. Division questions are constructed with whole-number quotients; the expert calculus questions also use generated values that produce integer answers.
Work an example
38 × 7 − 24
Break 38 × 7 into 30 × 7 and 8 × 7: 210 + 56 = 266. Then subtract 24 to get 242.
Breaking a calculation into familiar chunks can be quicker than trying to hold the whole expression in working memory. For 15 × 5 + 10, for instance, find 15 × 5 first, then add 10.
Try four quick problems
Choose one of four answers and select Check answer. Each example uses values that can appear at its matching game level. The worked steps appear after you check.
2. Bridge to 100
98 + 27
3. Divide, then add
160 ÷ 8 + 9
4. Square before adding
4² + 12
These are practice examples, not a game score or leaderboard attempt. Answers are not saved or submitted.
Score and personal records
Your score is the number of correct answers in one 30-second run. A wrong answer ends the run; there are no partial points. The best score is stored in this browser separately for each difficulty, so it stays available on this device without an account. Clearing this site's browser storage removes those local records.
You can also choose to submit a score to the online daily and all-time leaderboards from the results flow. That is separate from your local personal best and is optional.
Practical mental math habits
- Split large products. Use tens and ones, such as 38 × 7 = 30 × 7 + 8 × 7.
- Use a nearby hundred. For 98 + 27, move 2 from 27 to make 100 + 25 = 125. Two-digit additions in this range appear in Normal.
- Use inverse operations to check. After division, multiply the quotient by the divisor; after subtraction, add the difference back.
- Handle the expression in order. In a two-step expression such as 15 × 5 + 10, complete the multiplication before addition.
- Calculate before using the choices. The answer options are not a shortcut; solve the expression and use the choices only to check your result.
- Choose a comfortable level first. Start with Easy if you are new, then compare your own records as you practise harder levels. No average score is assumed.
- Pause rather than guess. Because one incorrect choice ends the run, a brief check can be worth more than an impulsive tap.
Frequently asked questions
How long is one game?
The solving period is 30 seconds. A three-step countdown appears before the timer starts.
What happens when I choose a wrong answer?
The run ends immediately and the results screen shows your score and the best score for the selected difficulty.
Do I need an account?
No. You can play without signing up. Your personal best is saved locally in your browser; online leaderboard submission is optional.
Are questions the same every time?
No. Values and question patterns are generated during play, so a new run can present different questions.
Does the game work on a phone?
Yes. The game runs in a modern mobile or desktop browser and uses large answer buttons for touch and mouse input.