Fraction Addition & Subtraction
Practice fraction addition and subtraction with a free, browser-based math game. Includes step-by-step strategy, common mistakes, and classroom tips.
MathMetric Conversion
Metric conversion is almost pure mechanical skill: every step is a power of ten. Below: the quick method and the direction check.
Choose your difficulty
Pick a level to start playing. You can switch at any time.
How to play
Convert the value into the unit asked for, then tap the correct number.
Tip: your progress and best score are saved in this browser only.
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MathWhat you are actually practicing
Metric conversion is the rare school topic that is almost pure mechanical skill: every step is a power of ten, so converting is really just moving the decimal point. One metre is 100 centimetres. One kilometre is 1000 metres. One kilogram is 1000 grams. One litre is 1000 millilitres.
Because the system is decimal, there is no arithmetic to work out — only a direction and a number of places to shift. That is what makes it worth drilling to the point of automaticity: it frees attention for the actual problem later.
How the game works
You are given a value in one unit and asked for the same quantity in another. Four choices, a countdown, and an immediate reveal when you miss. Your score and best score stay in this browser only.
Easy uses single-step conversions with small numbers. Medium widens the range. Hard mixes all the pairs, so you must read which unit you are converting to before answering.
Strategies that actually move your score
Read the destination unit first. Converting 3 m to cm multiplies by 100, but to mm multiplies by 1000. The destination decides everything.
Count the zeros rather than doing long multiplication. 100 means add two zeros; 1000 means add three. This is faster and less error-prone than written multiplication.
Sanity-check the direction. Going from a larger unit to a smaller one must give a bigger number. If your answer is smaller, you divided instead of multiplied.
Common mistakes, and the fix for each
Mistake: multiplying when you should divide. Converting cm to m requires division; this game only asks the multiply direction, but the habit matters elsewhere. The fix is the size check.
Mistake: dropping or adding a zero. 1000 has three zeros, not two. The fix is to count them explicitly each time rather than trusting instinct.
Mistake: converting to the wrong unit. Reading "cm" when the question says "mm" costs the whole problem. The fix is to point at the destination unit before calculating.
A short, honest FAQ
Do I need to install anything? No. It runs in any modern browser.
Why only metric? Because metric steps are all powers of ten, which makes them fast to drill and directly useful.
What age is it for? Roughly grades 4 through 7.