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Description
casse tete mathematique addition des anneaux pour atteindre 50The wooden math puzzle 5 rotating rings, diameter 12. 8 cm, natural wood. Objective: align the numbers in each column to obtain a sum of 50. Over 65,000 possible combinations, only one is correct. An educational tool and intellectual challenge for ages 8 and up. Objective: sum 50 per column Each column of numbers must total exactly 50 seemingly simple, but with 65,000 possible combinations and only one correct solution. 5 independent rotating rings
The wooden math puzzle — 5 rotating rings, diameter 12.8 cm, natural wood. Objective: align the numbers in each column to obtain a sum of 50. Over 65,000 possible combinations, only one is correct. An educational tool and intellectual challenge — for ages 8 and up.
Objective: sum 50 per column
Each column of numbers must total exactly 50 — seemingly simple, but with 65,000 possible combinations and only one correct solution.
5 independent rotating rings
Each ring rotates independently and exposes or hides the numbers on the lower ring — each rotation changes the set of visible values in each column.
65,000 combinations — 1 solution
The complexity is exponential — each ring movement interacts with the others. The unique solution requires logic, patience, and method.
Natural wood — D12.8 cm
Made of quality natural wood, pleasant to the touch. Diameter 12.8 cm — compact and can be placed on a desk or shelf.
Stimulates logic and concentration
Develops logical thinking, problem-solving, patience, and numerical skills — an educational tool disguised as a game.
Educational gift for all ages
For children aged 8 and up, adults, math enthusiasts, and puzzle lovers — a challenge that never gets old.
Wooden math puzzle — 5 rings · D12.8 cm · sum 50 · 65,000 combinations
On the surface, it's simple: turn the rings so that each column displays a sum of 50. In practice, each rotation of a ring simultaneously modifies several columns — and with 65,000 possible combinations for a single correct solution, brute force logic is not enough. It requires a method, patience, and the satisfaction of having overcome one of 65,000 dead ends before finding the right one. Made of natural wood, 12.8 cm in diameter — the puzzle that stays on the desk until you've solved it.
| Material | Natural wood |
| Diameter | 12.8 cm |
| Rings | 5 — rotating and independent |
| Objective | Sum of 50 in each column |
| Combinations | Over 65,000 — 1 single solution |
| Recommended age | 8 years and up |
| Packaging | Shrink wrap |
Tip for solving: start by fixing a reference ring (the central one, for example) and analyze the columns one by one. Note the visible values before each rotation to understand the impact of each movement. A systematic column-by-column approach is more effective than random trial-and-error — even if trial-and-error is part of the fun.
High difficulty level: with over 65,000 possible combinations and only one correct solution, this puzzle is designed to be challenging. Don't get discouraged — solving it may take several sessions. This is precisely what makes it a memorable and satisfying challenge.
🎁 The gift for logical minds: natural wood, D12.8 cm, 5 rings, 65,000 combinations. A unique intellectual challenge for a birthday, Christmas, teacher gift or math lover's gift — for children aged 8 and up and adults who love puzzles.
Frequently Asked Questions
How does the puzzle work?
The puzzle consists of 5 independent stacked rotating rings. Each ring rotates freely and exposes or hides the numbers on the lower ring. The goal is to align the rings so that the sum of the numbers in each column is exactly 50. With over 65,000 possible combinations, only one configuration is correct.
Is it really difficult to solve?
Yes — it's a serious challenge. The difficulty comes from the fact that each rotation of a ring simultaneously modifies several columns, creating complex dependencies between values. With 65,000 possible combinations for a single solution, a methodical approach is necessary. Solving it can take several hours or several sessions.
What is the recommended age to play?
From 8 years old — but the complexity of the challenge is especially suitable for adults and children who are comfortable with mathematics. For younger children, free exploration of the rotating rings remains a fun and stimulating activity even without the goal of formal resolution.
Is there a unique or multiple solution?
There is only one correct configuration among the 65,000 possible combinations — the one where all columns simultaneously display a sum of 50. It is this unique character of the solution that makes solving it so satisfying.
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Everything you need to make a income from your property.
Format: Kindle
I liked that the expertise of the author is palpable. This comprehensive guide goes through the fundamentals with realistic advice on everything from creating your first listing to handling visitors and optimizing revenue. The author breaks the different aspects down clearly, from step one, Is hosting right for you? to setting up your first property; From understanding associated expenses and evaluating markets to ensuring a memorable experience for guests and maximizing positive reviews, the author covers everything you need. This is the book you need if you have the property and you are not sure how to make it produce income for you.
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Reviewed in the United States on October 29, 2025
★★★★★ 5
A straightforward, no fluff guide for beginners
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I was mostly worried about whether the cost would actually make sense compared to the profit. The sections on business basics and budgeting were super helpful. This book doesn’t just sell a dream. It gives you real, practical tools and downloadable resources to figure out if your idea can actually work. A straightforward, realistic guide for beginners.
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Reviewed in the United States on October 28, 2025
★★★★★ 5
A very thorough "How-To"!
Format: Kindle
This book is full of tons of resources and recommended tools to guide you along the way from a to z.. At the end of each chapter, the author also provides super useful "Action Items" to get you moving forward, breaking the process down to manageable doable pieces. Loved all the useful real-world tips that some Airbnb property owners just may overlook... as well as the BONUS materials at the end too!
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Reviewed in the United States on October 30, 2025
★★★★★ 4
Just the guide that I needed!
Format: Kindle
I've been planning to start an Airbnb business, and this guide book is a helpful resource - it's exactly what I needed! Without a clue of where to start, this book helps me understand the the whole process step by step, from setting up your first listing to managing guests and maximizing your income. It's written in a clear manner, with practical the advice , simplifying the process for newcomers like me. There are tips on pricing, optimizing space, and how to make sure guests have a great experience - all are super helpful advice. This book also covers important financial aspects and tax compliance, which is super helpful - this is a must read for anyone venturing into this Airbnb business.
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Reviewed in the United States on October 17, 2024
★★★★★ 5
Practical, logical, and comprehensive guide to starting and running an Airbnb
Format: Kindle
This is a great resource for anyone who wants to own and operate an Airbnb (short-term rental housing). The book is comprehensive. It starts with the basics and goes on and on, covering every conceivable issue, from startup basics to day-to-day operations, legal issues that might come up, how to hire a cleaning crew—even real estate issues many people might not be aware of. The only thing I found missing was instructions for how to deal with bedbugs, which are a growing problem throughout the world (and can wreak havoc on any rental property).
The book is well-organized, which makes it easy to read… perfect for anyone trying to learn the business from the ground up. It is well-researched, with many examples to show the reader how things work in the real world. There are a number of resources mentioned also: websites for additional information on how to compare rates, and so on.
The author is practical and pragmatic. He balances caution with enthusiasm (and vice versa). I recommend it to anyone who wants to gain additional income through Airbnb.
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Reviewed in the United States on October 14, 2024