**Useful Tools:**

- Graphing Tool
- Prime Factorization Calculator – Calculator Soup
- Modulo Calculator – MiniWebtool
- Modular Arithmetic Solver – Congruence Calculator – Online Tool
- PowerMod Calculator
- Factor Calculator
- Long Division Calculator with Remainders
- Manual Method of Calculating Square Roots
- Geometric Calculators
- Base Converter
- Step-by-Step Calculators

Resources:

- NYC Math Team
- SIGMAA on Circles
- Mathcentre
- Math All Star Program
- The Saab MATHCOUNTS Online Testing
- MathBits (Algebra and Geometry)
- Mathemania — Free Math Worksheets.
- Prep for Paper
- Better Explained