How to Simplify and Use Ratios - Scaling, Proportions & Examples
Learn how to simplify ratios, scale them up or down, solve proportions, and convert ratios to fractions or percentages with clear, step-by-step examples.
How to Use a Basic Calculator - Step-by-Step Guide
Master add, subtract, multiply and divide on a basic calculator with memory keys, order of operations and examples.
How to Use a Scientific Calculator - Trig & Logs
Master trig, logs, exponents, angle modes and memory/history. Clear steps with practical examples.
How to Plot Functions - Cartesian, Parametric & Polar
Graph functions online: Cartesian, parametric and polar. Learn window/scale selection with worked examples.
How to Use Fractions - Operations & Simplifying
Add, subtract, multiply, divide and simplify fractions. Includes mixed numbers and decimal conversion steps.
How to Calculate Percentages - % Of & % Change
Learn % of, % change and % difference with clear formulas and worked examples you can reuse anywhere.
How to Test Primes & Factorise - Methods & Tips
Check primality, build factor trees and generate primes. Learn the sieve of Eratosthenes with examples.
How to Multiply, Invert & Solve with Matrices
Matrix multiplication, determinant, inverse and solving Ax=b explained with clear, worked examples.