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 • • 3h ago

Hard/Unsolved Help with puzzle needed

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2 Upvotes

I couldn't solve it. AI says that puzzle has 1 solution. But i couldn't find it


r/mathpuzzles • • 3h ago

Help with puzzle needed

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1 Upvotes

r/mathpuzzles • • 7h ago

Algebra Find what each symbol hides

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2 Upvotes

Each fruit symbol stands for a fixed number. Use the solved equations to work out what each symbol hides, then find the missing sum. (Puzzle from the game Rule Hunter)


r/mathpuzzles • • 11h ago

Logic Can you crack this math logic puzzle? 🧠 🧮

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0 Upvotes

r/mathpuzzles • • 18h ago

Logic Every region constrains the next one. Where would you start?

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1 Upvotes

r/mathpuzzles • • 20h ago

Solve these 2 questions

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1 Upvotes

r/mathpuzzles • • 1d ago

Recreational maths [OC] Daily Math Challenge: Speed Challenge vs. Pro Challenge (Multiple Solutions!)

1 Upvotes

Hey math puzzle fans! Here are today’s two daily QuizSum arithmetic challenges:

⚡ SPEED CHALLENGE
🎯 Target Number: 75
🔢 Available Digits: 5, 10, 15, 20, 25
➕ Operators Allowed: +, -, ×, ÷
Goal: Find 3 distinct equation paths that reach 75!

🧠 PRO CHALLENGE
🎯 Target Number: 80
🔢 Available Digits: ,5, 8, 12, 16, 20
➕ Operators Allowed: +, -, ×, ÷, (, )
Goal: How many total valid equation paths can you discover?

Drop your solutions in the comments below using spoiler tags like this: (25 - 2) * 6 - 4

How many unique paths can you find for each?


r/mathpuzzles • • 1d ago

Can you find the answer in given time

1 Upvotes

r/mathpuzzles • • 1d ago

Can you calculate r?

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19 Upvotes

r/mathpuzzles • • 1d ago

Algebra Find the hidden rule connecting these number pairs

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1 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 • • 23h ago

Test your brain! Can you solve this fraction puzzle?

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0 Upvotes

r/mathpuzzles • • 1d ago

An ancient Chinese math puzzle shows how to win at cards, horse races and gerrymandering

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scientificamerican.com
5 Upvotes

r/mathpuzzles • • 1d ago

Logic Can you crack this math logic puzzle? 🧠 🧮

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1 Upvotes

r/mathpuzzles • • 1d ago

Recreational maths The Four Color Theorem says it’s possible. Can you solve the coloring?

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2 Upvotes

r/mathpuzzles • • 2d ago

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

2 Upvotes

r/mathpuzzles • • 2d ago

Algebra Find the hidden rule behind these number transformations

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0 Upvotes

Each number on the left is turned into the number on the right by the same hidden rule. Work out the rule from the known examples and find the missing output. (Puzzle from the game Rule Hunter)


r/mathpuzzles • • 2d 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 • • 2d ago

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

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 • • 2d 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 • • 2d ago

Looking for the right sub for help with a geometry puzzle

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1 Upvotes

r/mathpuzzles • • 2d 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 • • 2d ago

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

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0 Upvotes

r/mathpuzzles • • 3d ago

Geometry Can you calculate r?

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15 Upvotes

r/mathpuzzles • • 3d 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)