Binary and Hexadecimal Explained: Converting Number Bases
How place value works in binary and hexadecimal, and how to convert between decimal, binary and hex step by step.
Tagged: number
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Roman Numerals Explained: How to Read and Write Them
Learn the seven Roman numeral symbols, the subtraction rule, and how to convert years like 2026 and 1994 to and from Roman numerals.
Rounding and Significant Figures: Rules and Examples
How to round to decimal places, significant figures and the nearest 10, 100 or 1000, plus the rules for counting significant figures.
Scientific Notation (Standard Form) Explained
Write very large and very small numbers in scientific notation, convert back, and multiply and divide numbers in standard form.
How to Find the LCM and GCF (Three Methods)
Find the least common multiple and greatest common factor by listing, prime factorisation and Euclid's algorithm, and learn when to use each.
How to Simplify Square Roots (Surds) Step by Step
Simplify square roots like √50 and √72 by taking out square factors, combine surds, and rationalise denominators, with clear worked examples.