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Number Theory
Number Theory
Practice
Overview
Divisibility, primes, modular arithmetic, Diophantine equations
Practice
Junior Mathematical Challenge 2021
Junior Mathematical Challenge 2020
Fill the digit to make divisible by 3
Make 15 divisible by 15
Junior Mathematical Challenge 2023
Question 3
Junior Mathematical Challenge 2021
55*44* divisible by 72
Find digits in 35!
Digital root of 100!
More practice problems →
Deeper topics
Arithmetic functions
Diophantine Approximation
Diophantine Equations
Divisibility of numbers. General properties
Divisibility rules
Division with remainder. Arithmetic of remainders
Equations in integers
GCD and LCM. Mutual primality
Modular Arithmetic
Number theory. Divisibility (other)
Parity
Prime factorisation
Prime Numbers
Prime numbers and their properties
Products and factorials