Dr. UVC Math

DEDUCE ME!

25 Prime-Number Riddles · Walk Math Book 2

There are exactly 25 primes below 100. This book has exactly 25 riddles. No pencil, no calculator — every one cracks on a walk, and every answer comes with The Secret.

DEDUCE
ME!
25 riddles · 5 levels
prime numbers only
2 · 3 · 5 · 7 · 11
Walk Math · Book 2 · Primes

Deduce Me! 25 Prime-Number Riddles

"I am a prime that sits exactly one below a square. I am the only prime in the world who can say that. Who am I?" Twenty-five riddles like that, rising through five levels — from the loneliest prime to the Sheldon prime, by way of twins, mirrors, carousels and one convincing fake.

Ages 8+ · 25 riddles · 5 levels · 42-page PDF · print it or read it on the phone mid-walk.

$2.99Buy now — $2.99 →

The 25 primes below 100 — and the 25 riddles that hide in them

Colour by family: 2, 3, 5 and 7 take their own colours, and every larger prime follows the colour of its last digit. Every prime ends in 1, 3, 7 or 9 — which is Riddle 10's secret, sitting in plain sight.

Five levels, one skill

  1. Level 1 — Meet the Primes. The even one, the twins, the mirror, the last guard.
  2. Level 2 — Digit Detectives. Prime digits, palindromes, carousels.
  3. Level 3 — Crossover Numbers. Where primes meet squares, cubes, Fibonacci and the taxicab.
  4. Level 4 — Rare Breeds. Mersennes, double Mersennes, and Euler's prime factory.
  5. Level 5 — The Grand Finale. Splitting a century, catching a fake, and guarding the thousand.
Instant download · Personal & single-classroom license · Questions: [email protected]
© 2026 Dr. UVC Universal LLC. This PDF is licensed for personal use and use within a single classroom by the purchasing teacher. You may print copies for your own children or students. You may not redistribute, resell, repost, or include this file or its puzzles in other products. School- or district-wide licensing: [email protected].