Use these pages for direct number work: percentages, fractions, roots, sequences, and whole-number checks that often sit inside bigger homework, finance, or engineering tasks.
A deeper guide to percentages, percentage of a value, and percentage change, with attention to base values, direction, and why percentage increase and decrease are not perfectly reversible.
Use these pages for formulas, worked examples, and common mistakes before or after you open a calculator.
A deeper guide to percentages, percentage of a value, and percentage change, with attention to base values, direction, and why percentage increase and decrease are not perfectly reversible.
A stronger arithmetic guide covering addition, subtraction, multiplication, and division as the foundation for checking formulas, rearranging expressions, and keeping later calculations physically sensible.
A fuller guide to fractions, decimals, and ratios, focused on choosing the most readable form, preserving proportional meaning, and moving cleanly between equivalent representations.
A guide to powers, roots, and factorials that explains what repeated multiplication, inverse powers, and combinatorial growth mean in practical calculations.
A deeper guide to primes, greatest common divisors, and least common multiples, focused on simplification, divisibility, and the structural patterns behind clean arithmetic.
A fuller guide to arithmetic and geometric sequences and series, with a focus on pattern recognition, nth-term logic, and deciding whether you need a single term or a cumulative total.
These PDFs are designed for quick revision, planning, and repeat checking away from the browser.
A fuller printable revision guide for core arithmetic, including estimate-first habits, sign checks, place value, and worked examples that support every other calculator on the site.
A compact but richer percentage, ratio, and proportion sheet that keeps base values, equivalent forms, and proportional reasoning visible.
A more useful quick-reference sheet for arithmetic and geometric sequences and finite sums, with pattern checks and term-versus-sum reminders.
A fuller formula sheet for primes, GCD, LCM, squares, roots, and factorials, organised around simplification and structural reasoning.
The guide hub keeps the conceptual pages and the live tools close together so you can move between explanation and calculation without losing context.