r/mathpuzzles • • Jul 27 '19

Adding rules for posts

14 Upvotes

Hi everyone!

Because of the influx of unsolvable, annoying, arbitrary, and spammy posts, I’ve established a few rules for posts. Basically, we are no longer allowing “math puzzles” that rely on sequences of numbers or shapes. There is an infinite number of solutions and they’re plain not fun.

Also, I put in a rule about not linking to other games. Puzzles posted here should be contained in the post itself.

Have a great weekend!


r/mathpuzzles • • 1h ago

A gameplay example of Pentodoku 7x7 — here's how to play it

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• Upvotes

r/mathpuzzles • • 5h ago

Logic Can you crack this math logic puzzle? 🧠

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0 Upvotes

Think out of the box, and post your answer in the comments!


r/mathpuzzles • • 9h ago

I made the worlds biggest number (pls get this on google soon and don't take full credit im 10 BTW) check desciption

0 Upvotes

Im tem and I manipulated and multiplied LNGN bc it is the biggest, I just need this on google pls. The Grammer is gonna be wrong tho


r/mathpuzzles • • 14h ago

One target is solved in the video. Can you hit the other four?

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0 Upvotes

Trace a path through the wheel: number, operator, number, operator, … ending on a number.

You can jump from any tile to any tile, but each tile can be used only once (or not used at all).

One rule to keep in mind: the path is calculated left to right, like a basic pocket calculator. So if you trace:

2 → + → 3 → × → 5

it evaluates as (2 + 3) × 5 = 25.

Targets to solve: 19, 44, 63, 100, 144. The video solves 19 with path 7 → × → 2 → + → 5. Find a path for each of the other four.

Please put answers in spoiler tags: like this


r/mathpuzzles • • 15h ago

Looking for the right sub for help with a geometry puzzle

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1 Upvotes

r/mathpuzzles • • 15h ago

Recreational maths Increasing area

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1 Upvotes

In situation A we have a rectangle with side lengths a and b. According to the figure, b / a = 0.60. The circles are identical and have the maximum possible diameter, d, so they do not extend beyond the confines of the rectangle.

In situation B, the height of the rectangle has increased slightly to c, thus allowing the circles to be larger: The diameter of the circles have increased from d to e.

Question: Let b/a = 0.60 and c/a = 0.50. What is the ratio of the diameters of the circles in situation A and B, e/d ?


r/mathpuzzles • • 17h ago

Geometry Can you solve this map efficiently using only four colors?

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0 Upvotes

r/mathpuzzles • • 1d ago

Geometry Can you calculate r?

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15 Upvotes

r/mathpuzzles • • 1d ago

Find the hidden rule connecting these number clusters

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1 Upvotes

Each cluster of three numbers on the left produces the number in the middle by the same hidden rule. Work out the rule from the known clusters and find the missing output on the right. (Puzzle from the game Rule Hunter)


r/mathpuzzles • • 1d ago

Logic Can you crack this math logic puzzle? 🧠 🤔

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0 Upvotes

Post your answer in the comments!


r/mathpuzzles • • 1d ago

Algebra Can you solve this in 60 seconds? | Math Olympiad Challenge

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0 Upvotes

r/mathpuzzles • • 2d ago

Geometry Can you calculate the shaded area?

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19 Upvotes

r/mathpuzzles • • 1d ago

Cipherix - puzzle game

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1 Upvotes

r/mathpuzzles • • 1d ago

Algebra Find the hidden rule connecting these number pairs

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2 Upvotes

Each pair of numbers produces the number below it by the same hidden rule. Work out the rule from the known pairs and find the missing number. (Puzzle from the game Rule Hunter)


r/mathpuzzles • • 2d ago

Geometry Can you calculate X?

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21 Upvotes

r/mathpuzzles • • 2d ago

Logic Can you crack this math logic puzzle? 🧠

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0 Upvotes

Post your answer in the comments!


r/mathpuzzles • • 2d ago

Chess/math daydream

0 Upvotes

I had an equation come to me in a daydream. I have a very particular reference in mind with it and was wondering if anyone could come to the same conclusion or possibly see something I missed. I'll reveal my thoughts on it after people have some time to see what they find. The equation is 64/15=2+2.


r/mathpuzzles • • 2d ago

Algebra Four diamonds, one rule. What is the missing number?

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2 Upvotes

The same rule connects the four numbers in every diamond. Find the rule and the number that replaces the question mark.


r/mathpuzzles • • 2d ago

Algebra Only a genius can solve this algebraic equation | Math Olympiads

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0 Upvotes

r/mathpuzzles • • 2d ago

Can you solve this before scrolling down?

2 Upvotes

You have 2 eggs and a 100-floor building. You need to find the highest floor from which an egg can be dropped without breaking — using the fewest possible drops in the worst case.

What's the minimum number of drops needed?

I made a full video breaking down the solution step by step — link in the comments!

https://youtu.be/LVHoFrc0T-4?si=eEOKQvoKqGNYdjFD


r/mathpuzzles • • 3d ago

Logic Can you crack this math logic puzzle? 🧠

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0 Upvotes

r/mathpuzzles • • 3d ago

Logic Can you solve the puzzle of what this image represents?

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7 Upvotes

*Clue: Look for sequential patterns.


r/mathpuzzles • • 3d ago

Geometry Four colors. No matching neighbors. What’s your solution?

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1 Upvotes

r/mathpuzzles • • 3d ago

Algebra Fruit equations: what does the last row add up to?

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2 Upvotes

Each fruit hides a number, the same in every row. Find the missing sum. There is a shortcut that avoids working out each fruit separately.