Tip Calculator – Calculate Tips & Split Bills Fairly
Easily calculate tips and split bills with our tip calculator. Adjust for tax, service charge, and group size for fair gratuity worldwide.
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.