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Number Puzzles

Part of Math Riddles collection

Explore 655+ unique, interactive number puzzles puzzles.

Fun counting games, prime number riddles, and secret code math challenges.

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Showing Number Puzzles riddles

The Repeating Cycle

What is the 100th digit in the repeating decimal of 1/7 = 0.142857142857...?

22,774 solved Number Puzzles

What is the pattern: 1=1, 1+3=4, 1+3+5=9, 1+3+5+7=16. What is 1+3+5+7+9+11?

15,277 solved Geometry Riddles

The Absolute Zero

I am the lowest possible temperature: -273.15°C. At me, all molecular motion stops. What...

20,784 solved Number Puzzles

The Antimatter Mirror

I am the exact opposite of regular matter. When I meet my counterpart, we...

11,908 solved Insect Riddles

The Staircase Sum

What is 1+2+3+4+...+100?

11,180 solved Number Puzzles

What is the maximum number of pieces you can get with 3 straight cuts...

24,278 solved Number Puzzles

The Percentage Trap

A store raises prices by 20%, then offers a 20% discount. Is the final...

19,125 solved Number Puzzles

What is the sum of all digits from 1 to 99?

17,344 solved Number Puzzles

The Leap Year Count

How many leap years are there from the year 1 to 2000?

15,918 solved Number Puzzles

The Counting Fingers

I have 10 of me on your hands and 10 on your feet. What...

3,955 solved Number Puzzles

What kind of tree can fit in your hand?

9,062 solved Biology Riddles

The Math Problem

Why was the math book sad?

6,794 solved Number Puzzles

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