Introduction
  • Introduction
Primes and Prime Factorizations
  • Primes and Prime Factorizations Topic Lecture
  • Legendre's Formula
  • 2017 AMC 12B Problem 16
  • 2017 AMC 12B Problem 16 | Solution
  • 2016 AMC 10A Problem 22
  • 2016 AMC 10A Problem 22 | Solution
  • Furman WMT 1999 Senior Problem 8
  • Furman WMT 1999 Senior Problem 8 | Solution
  • U.Maryland HSMC 1998 1 Problem 16
  • U.Maryland HSMC 1998 1 Problem 16 | Solution
  • 2014 AIME 2 Problem 8
  • 2004 AIME 2 Problem 8 | Solution
  • Primes and Prime Factorizations Quiz
Exponents and Perfect Squares
  • Exponents Review and Factor Manipulations
  • Perfect Squares and Cubes
  • 2013 AMC 12B Problem 9
  • 2013 AMC 12B Problem 9 | Solution
  • AMC 10A 2005 Problem 15
  • AMC 10A 2005 Problem 15 | Solution
  • 2020 AMC 10A Problem 15
  • 2020 AMC 10A Problem 15 | Solution
  • AMC 10A 2007 Problem 17
  • AMC 10A 2007 Problem 17 | Solution
  • 2010 AIME 1 Problem 1
  • 2010 AIME 1 Problem 1 | Solution
  • Exponents and Perfect Squares Quiz
Divisibility & Modular Arithmetic
  • Modular Arithmetic Baiscs
  • Chinese Remainder Theorem
  • Fermats Little Theorem & Eulers
  • Divisibility Tricks
  • 2019 AMC 10B Problem 14
  • 2019 AMC 10B Problem 14 | Solution
  • Canada Fermat 2001 Problem 10
  • Canada Fermat 2001 Problem 10 | Solution
  • 2006 AMC 10B Problem 11
  • 2006 AMC 10B Problem 11 | Solution
  • 2005 AMC 12A Problem 8
  • 2005 AMC 12A Problem 8 | Solution
  • Charlotte 2009 Comprehensive Problem 4
  • Charlotte 2009 Comprehensive Problem 4 | Solution
  • 2018 AMC 10B Problem 13
  • 2018 AMC 10B Problem 13 | Solution
  • 2017 AMC 10B Problem 14
  • 2017 AMC 10B Problem 14 | Solution
  • 2017 AMC 12B Problem 19
  • 2017 AMC 12B Problem 19 | Solution
  • 2011 AMC 8 Problem 22
  • 2011 AMC 8 Problem 22 | Solution
  • Divisibility & Modular Arithmetic Quiz
GCD, LCM, & The Euclidean Algorithm
  • GCD Topic Lecture
  • LCM Topic Lecture
  • Euclidean Algorithm Topic Lecture
  • Special Properties
  • 2016 AMC 8 Problem 20
  • 2016 AMC 8 Problem 20 | Solution
  • 2001 AMC 10 Problem 8
  • 2001 AMC 10 Problem 8 | Solution
  • 2005 AMC 12A Problem 18
  • 2005 AMC 12A Problem 18 | Solution
  • 2018 AMC 10B Problem 23
  • 2018 AMC 10B Problem 23 | Solution
  • 1986 AIME Problem 5
  • 1986 AIME Problem 5 | Solution
  • 1985 AIME Problem 13
  • 1985 AIME Problem 13 | Solution
  • GCD, LCM, & The Euclidean Algorithm Quiz