Mental arithmetic
Make common addition, subtraction, multiplication and division operations automatic enough to solve under severe time pressure.
Optiver 80 in 8 Practice Test
← BackAuthentic 80 in 8 Mode
Take a complete 80-question, 8-minute Optiver-style mental maths practice test. Correct answers gain a point and incorrect answers lose a point. Your free attempt uses the same fixed 80-question test each time. Upgrade to Premium for a fresh randomized 80 in 8 on every attempt, plus targeted Integer, Decimal, Fraction and Zen practice modes.
Progress
No account is needed to take the test. Create one afterwards to save this result, review your questions and track progress.
About the assessment
About the Optiver 80 in 8 assessment
The Optiver 80 in 8 is a speed-arithmetic screen built around 80 mental-maths questions in 8 minutes. The calculations are individually straightforward; the difficulty is sustaining roughly one answer every six seconds without allowing avoidable arithmetic errors to compound across the full run.
EverythingQuant lets you take one complete fixed 80-question Authentic Mode practice test for free without creating an account. Your result includes speed, accuracy and integer/decimal/fraction breakdowns; creating a free account saves that same completed attempt for later review. Premium adds fresh randomised Authentic tests plus targeted Integer, Decimal, Fraction and Zen modes.
Questions
80
Time
8 minutes
Free practice
Full fixed 80-question test
Premium
Fresh tests + targeted drills
EverythingQuant is an independent preparation platform. This practice tool is not an official Optiver assessment and does not guarantee an interview outcome.
What you are training
Skills this practice is designed to build
Fractions & decimals
Move between integers, fractions and decimal representations without letting notation break your rhythm.
Sustained accuracy
Protect accuracy across the entire eight-minute run instead of trading too many points for raw speed.
Pace control
Learn which calculations should be immediate and which deserve a quick check before you commit.
How to prepare
Use the tool deliberately
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1
Take the free full test
Start with the complete fixed 80-question run so your first benchmark reflects the actual pacing problem rather than an isolated drill.
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2
Review the bottleneck
Use the result breakdown to see whether integers, decimals or fractions are disproportionately slow or inaccurate, then save the attempt to your free account if you want to keep the benchmark and review the questions later.
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3
Isolate the weak operation
Use Premium targeted modes when one question family is clearly limiting your score instead of repeatedly practising the whole mix.
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4
Return to fresh full runs
Use fresh randomised Authentic Mode tests to measure whether the improvement transfers to unseen questions under the full eight-minute clock.
Keep preparing
Continue your Optiver preparation
Optiver preparation hub
Connect 80 in 8 practice with EverythingQuant's wider Optiver assessment and interview preparation map.
Optiver interview questions
Move from speed arithmetic into the quantitative and reasoning questions used later in interview preparation.
Optiver trader interview guide
See where the mental-maths screen sits within the broader Optiver quantitative-trader process.
Personalised Optiver roadmap
Organise mental maths alongside your wider probability, interview and assessment preparation.
FAQ
Optiver 80 in 8 questions
What is the Optiver 80 in 8?
It is a rapid mental-maths assessment built around attempting 80 arithmetic questions in 8 minutes.
Can I practise the Optiver 80 in 8 for free?
Yes. EverythingQuant provides one complete fixed 80-question, 8-minute Authentic Mode practice test without requiring signup. You see the detailed result immediately and can create a free account afterwards to save that same attempt.
What do I get with a free EverythingQuant account?
After a guest attempt, you can create a free account to save that exact result without retaking the test. Signed-in results include individual question review and saved progress.
What does Premium add?
Premium generates fresh randomised Authentic Mode tests and unlocks targeted Integer, Decimal, Fraction and Zen practice modes.
What score should I aim for?
EverythingQuant does not present a fixed score as an official Optiver hiring cutoff. Use your first full attempt as a baseline and focus on improving speed and accuracy on unseen questions over time.
Is this an official Optiver assessment?
No. EverythingQuant is independent of Optiver. This tool is designed as preparation for the 80-in-8 format.
Integer Mode
Drill integer addition, subtraction, multiplication and division separately from the full test. Targeted modes are included with Premium.
Decimal Mode
Isolate decimal arithmetic and build the speed needed to handle awkward magnitudes without losing rhythm. Targeted modes are included with Premium.
Fraction Mode
Practise fraction arithmetic independently so conversions and common denominators stop costing time in full runs. Targeted modes are included with Premium.
Zen Mode
Remove the clock and work through mixed mental maths at your own pace before returning to timed practice. Zen Mode is included with Premium.