The maths of Class 10, taught to be understood rather than memorised: numbers and algebra, geometry and trigonometry, mensuration, statistics and probability. A fourth group collects the arithmetic that entrance and recruitment examinations keep asking, learned for speed.
Who it's for: School students around Class 10, and anyone older who wants the maths of school back before an examination or a course that assumes it. Everything can be read without an account.
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Each one stands on its own, so start wherever you like.
The algebra half of Class 10 maths: how whole numbers factor, what a polynomial's zeroes mean, solving two equations together, quadratic equations, and sequences that grow by a fixed step. Everything later in maths leans on these five chapters.
The shapes half of Class 10 maths: similar triangles, points and distances on a coordinate grid, the trigonometric ratios and what they are for, measuring heights you cannot climb, and the one clean fact about tangents to a circle.
The measuring half of Class 10 maths: areas of circle parts, surface areas and volumes of combined solids, finding the mean, median and mode of grouped data, and the first honest definition of probability.
The arithmetic that entrance and recruitment examinations keep asking, at every stage after school: percentages, ratio and proportion, rates and speed, factors and divisibility, averages and reading data. The class chapters touch these; examinations drill them, so this group does too.