Fraction to Recurring Decimal
A medium-tier problem at 26% community acceptance, tagged with Hash Table, Math, String. Reported in interviews at IXL and 5 others.
Fraction to Recurring Decimal shows up at Google, Goldman Sachs, TikTok, and Airbnb. It's a medium-difficulty problem with a 26% acceptance rate, which means most candidates either don't see the pattern or get trapped in implementation. You're dividing two integers and need to return a string with the decimal representation, marking any repeating cycle in parentheses. The catch: you can't just do floating-point arithmetic and hope. If this problem hits your live assessment and you freeze on how to detect cycles, StealthCoder surfaces a working solution in seconds, invisible to the proctor.
Companies that ask "Fraction to Recurring Decimal"
Fraction to Recurring Decimal is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Made by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too.
Get StealthCoderThe trick is treating long division as a state machine. Perform division digit-by-digit, tracking remainders in a hash table. When you see a remainder you've seen before, you've found the cycle start. Most candidates try floating-point math first, which fails on precision. Others build the result string correctly but miss that the cycle detection requires storing remainder positions, not just values. The problem combines Hash Table, Math, and String manipulation in a way that feels unfamiliar until you've done it once. If you hit this live and the obvious approach breaks, StealthCoder runs the full algorithm invisibly and gives you the working code to adapt and submit.
Pattern tags
You know the problem.
Make sure you actually pass it.
Fraction to Recurring Decimal recycles across companies for a reason. It's medium-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Made by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Fraction to Recurring Decimal interview FAQ
Why does this have such a low acceptance rate?+
Most candidates don't realize you need long division simulation with remainder tracking. Floating-point math fails. Once you see the hash table trick for cycle detection, it's mechanical, but the insight isn't obvious. The 26% pass rate reflects that.
Is this still asked at FAANG?+
Yes. Google, TikTok, and Airbnb are all in the report. It's not as common as array problems, but when it appears, it's usually a filter. Companies like Goldman Sachs and ServiceNow ask it too.
What's the core pattern I need to know?+
Long division with state tracking. Perform division digit-by-digit, store each remainder and its position in a hash table. When a remainder repeats, you've found where the cycle starts. Mark the cycle in parentheses in the output string.
How does this relate to the topics listed?+
Hash Table stores remainder positions for cycle detection. Math covers the long division algorithm itself. String handles building the result with proper formatting and cycle notation. All three are essential.
What's the fastest way to prep this if I have one day?+
Understand long division first. Then code the remainder-tracking loop. The hardest part is building the result string correctly and inserting the parentheses at the right index. Trace through a simple example like 1/6 to lock in the logic.
Want the actual problem statement? View "Fraction to Recurring Decimal" on LeetCode →