Percentages
Free percentage game for 5th grade+: compute percentages of numbers mentally, from 10% and 50% up. Instant feedback, no sign-up.
Grade 5+ · Free · No sign-up
How to play & why it works
Each round asks for a percentage of a number — find 25% of 80, 10% of 340 — answered mentally on the number pad. The drill stays in friendly territory where clean strategies work, which is exactly where percent skill is built.
Percentages are the most-used school math in adult life: tips, discounts, interest, statistics. Yet most people never automate the two moves that make them easy — everything else is built from 10% (shift the decimal) and 50% (halve).
The strategy chain to practice: 10% is one decimal shift; 5% is half of that; 25% is a quarter (halve twice); 75% is three of those. For 15% of 60, take 10% (6) plus half of it (3). The game serves enough variety that the chains become reflexes.
The free MathIt app extends into percent-of-life problems (discounts, tips, interest), reverse percentages and percentage change, with adaptive difficulty throughout.
Almost all everyday percentage work runs through one anchor: 10%. Move the decimal one place and you have it; from there 5% is half of that, 20% is double, and 25% is a quarter of the whole. Students who learn the anchors handle tips, discounts and tax in their heads; students who only know the multiply-by-a-decimal formula reach for a phone.
The commutative trick is worth knowing too: 8% of 50 is the same as 50% of 8, and the second is trivial. Swapping the numbers when one side is friendlier turns a fair number of awkward-looking questions into one-second answers.
Skills you'll practice
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Frequently asked questions
How do you find a percentage of a number quickly?
Find 10% first by moving the decimal one place left, then build from it — 30% is that tripled, 5% is half of it, 15% is 10% plus 5%. Most real-world percentages are reachable in two steps this way.
What grade do students learn percentages?
Usually fifth and sixth grade, after fractions and decimals are established. Percentages are just hundredths, so they land much easier once fraction sense is in place.
Is 8% of 50 really the same as 50% of 8?
Yes — percentages are commutative, because both are 0.08 × 50. It is a genuinely useful shortcut whenever one of the two numbers is easier to take a percentage of.
Get the full game
Adaptive difficulty, daily streaks, and live 2–5 player math battles — free on iOS and Android.