Number TheoryPro Problems > Math > Number and Quantity > Number Theory
Featured Pro Problems
Without a calculator find a nine digit number that meets the criteria of the problem
A math problem involving Shrek wanting Fiona's telephone number
Strings of red lights and green lights on my Christmas tree - a Christmas word problem
A diophantine equation - quadratic in two variables
Use divisibility rules to determine the number with missing digits
Given two pieces of information about the three digit number, determine all possible values.
Solve an algebra problem involving a defined binary operation (the hashtag or pound symbol)
Find the sum of two binary numbers, write the answer in base ten
Full Directory ListingCrossing Out Numbers, How many zeroes?, Nine Digit Number, Pyramid of Blocks
Understanding Coronavirus Spread
A Question and Answer session with Professor Puzzler about the math behind infection spread.
Blogs on This Site
Reviews and book lists - books we love!
The site administrator fields questions from visitors.
Like us on Facebook to get updates about new resources