Mental Math Practice That Checks Your Work

Reading about a technique is not the same as being able to do it. This drill generates genuinely new problems, accepts your typed answer, and tells you whether it is right — then shows the mental route either way. Numbers change every round, so you can return as often as you like.

Mixed practice

Type your answer and press Enter. Every problem is generated on the spot and uses mixed mental arithmetic drawn from every stage. Get it wrong and the steps below show how that exact problem is solved mentally.

Correct: 0 / 0
Accuracy: —
Best streak: 0
Time: 0:00

Problem 1

83 − 46 = ?

Getting the Most Out of a Drill

Short, honest practice beats long, distracted practice. These four habits turn a five-minute session into progress you can actually measure.

One skill per sitting

Pick the stage you are actually working on and drill only that. Mixing two new techniques in a single five-minute session splits your attention and hides which one is still shaky.

Answer before you peek

Commit to a number first, every time. A wrong answer you committed to teaches you more than a right answer you read off the steps, because the mistake shows which part of the strategy you skipped.

Read the steps on every miss

Each generated problem carries the mental route that solves it. When you miss, compare that route with the one you used rather than simply noting the right number.

Track the streak, not the clock

Accuracy builds speed on its own. A run of eight correct answers in a row means the technique has stuck; a fast run with two misses usually means you guessed.

Drill One Stage at a Time

Each stage has its own generator, so the problems match the technique the lesson teaches. Work on the stage you are learning and move on once the answers stop feeling like guesses.

How the Score Works

Correct counts the problems you answered during this visit — nothing is stored on a server, so a refresh starts a clean run. Accuracy is that count as a percentage, and it is the figure worth watching: above 90% means the technique is reliable, while below 70% means the lesson deserves another read before you drill again.

Best streak is the longest unbroken run of right answers. It matters more than total volume because it measures consistency against fresh numbers, not familiarity with a fixed list. Time simply shows how long the session has been running — speed is a byproduct of accuracy, not a target on its own.

The written lessons stay the reference. If the drill keeps catching you on one family of facts, open the matching stage lesson, read the worked examples and common mistakes, then come back to the drill.