63 — 30% of 90 = 27, so 90 − 27 = 63. Or multiply 90 by 0.7 = 63.

How do I try a free AQA Mathematics question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live AQA GCSE Mathematics bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Is Kramizo really free for AQA Mathematics students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Are the Mathematics questions aligned to the AQA GCSE syllabus?

Every question is written against the published AQA GCSE Mathematics syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real AQA past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Kramizo

AQA · GCSE · Mathematics

One real Mathematics question.
No signup. 30 seconds.

Topic: Percentages: percentage of amounts, percentage change, reverse percentages. Pick an answer — get the mark scheme instantly.

Question · Difficulty 2/3

Decrease 90 by 30%.

Tap an option to see the mark scheme

Pick your board & subject

Try a real question from the bank — no signup needed.

2,881 questions

Exam boardSubject

One real Mathematics question.No signup. 30 seconds.

One real Mathematics question.
No signup. 30 seconds.