Math, School & Tools
Can you crunch this number for me?
The number-crunchers you reach for at school, at a desk or in a pinch: a full scientific calculator, percentages and fractions, descriptive statistics, GPA and grade planning, and a couple of everyday utilities.
Everyday math
Statistics
School & grades
Handy tools
Guides on this topic
- How to Calculate Percentages (The Easy Way) Master the three percentage questions that cover almost every real-life situation — percent of a number, one number as a percent of another, and percent change.
- Working With Fractions: A Clear Guide Add, subtract, multiply and divide fractions with confidence — the rules, why they work, and how to simplify and convert to mixed numbers and decimals.
- Standard Deviation Explained What standard deviation actually measures, the difference between sample and population, and how to calculate it step by step — with a calculator built in.
- How to Use a Scientific Calculator A friendly tour of the scientific calculator — trigonometry, logarithms, powers, roots, factorials and constants — with worked examples you can follow along.
- How to Create a Strong Password What actually makes a password strong, why length beats complexity, and how to generate and manage passwords you never have to remember.