Modular Arithmetic
Overview
Congruences and modular arithmetic
Practice
Transforming Sevens: Repeated Operations to Reach 7
Find the last digit of \( 77^7 \) using exponentiation.
Divisibility of Sums and Differences of Squares
Finding Trailing Zeros in Factorial of 2025
Find the last digit of the product of odd numbers up to 2025.
Check if the sum of two numbers is divisible by 10
Determine the number of 10-litre and 17-litre milk containers received.
Is the Largest Known Prime Number a Typographical Error?
Find the last digit of various exponential expressions.