Learn the method
Math guides that teach, then let you practise
Each guide explains one idea, works the examples with the real calculator, shows the usual mistakes, and ends at the tool where you can try your own numbers.
Arithmetic & NumbersHow to Add Fractions (Same and Different Denominators)
A clear method for adding and subtracting fractions: find a common denominator, combine the numerators, simplify. Worked examples with every step.
Grades 4–7
Arithmetic & NumbersHow to Calculate Percentages: 4 Problem Types, Solved
Learn the four percentage questions — % of a number, what percent, original value and percent change — with formulas and worked examples.
Grades 6–9
Algebra & FunctionsHow to Solve Quadratic Equations: Factoring and the Formula
Solve ax² + bx + c = 0 by factoring or the quadratic formula. Learn the discriminant, see worked examples, and check answers by substitution.
Grades 9–11
Geometry & MeasurementHow to Use the Pythagorean Theorem (With Worked Examples)
Find a missing side of a right triangle with a² + b² = c². Learn when to add, when to subtract, and how to test whether a triangle is right-angled.
Grades 8–10
Probability & CountingPermutations vs Combinations: How to Choose the Right One
Learn the difference between permutations and combinations, when order matters, and how repetition changes the count — with worked examples.
Grades 10–12
Statistics & DataMean, Median and Mode Explained (and When Each Misleads)
How to find the mean, median, mode and range, how an outlier changes them, and when to use sample versus population standard deviation.
Grades 6–10
Arithmetic & NumbersHow to Simplify Fractions to Lowest Terms
Simplify any fraction by dividing top and bottom by their greatest common factor. Includes Euclid’s algorithm and worked examples.
Grades 4–7
Arithmetic & NumbersHow to Find the LCM and GCF (HCF) With Prime Factors
Find the least common multiple and greatest common factor using prime factorization, with worked examples for two and three numbers.
Grades 5–8
Arithmetic & NumbersPrime Numbers Explained: Test, Factor and Count Divisors
What primes are, how to test a number quickly, how to factor it into primes and how exponents give the number of divisors.
Grades 5–9
Arithmetic & NumbersDivisibility Rules for 2 to 10, Explained
Quick tests to see whether a number divides evenly by 2, 3, 4, 5, 6, 7, 8, 9 or 10 — and why the digit-sum rule works.
Grades 4–8
Algebra & FunctionsHow to Solve Linear Equations Step by Step
Solve equations like 3x + 5 = 2x − 7 by collecting terms, isolating x and checking. Includes the no-solution and infinite-solution cases.
Grades 7–9
Algebra & FunctionsExponents and Powers: Rules, Negative and Fractional
Understand exponents as repeated multiplication, then extend them to zero, negative and fractional powers with worked examples.
Grades 7–10
Converters & NotationScientific Notation: How to Write and Convert Numbers
Write very large and very small numbers as a × 10ⁿ by moving the decimal point, with worked conversions both ways.
Grades 7–10
Geometry & MeasurementArea and Perimeter: Formulas for Common Shapes
Area formulas for rectangles, triangles, parallelograms and trapezoids, how perimeter differs, and common unit mistakes.
Grades 5–8
Probability & CountingProbability Basics: One Event, “And” and “Or”
The three core probability calculations with worked examples: a single event, two independent events both happening, and either happening.
Grades 8–11
Everyday & School CalculatorsHow to Calculate GPA on a 4.0 Scale
Calculate weighted GPA from letter grades and credits, with the standard 4.0 grade-point values and worked examples.
High school & college