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Mathematics · 0–69 · 21 concepts

Elementary School Mathematics

Reasoning-first Elementary School mathematics: 21 concepts, each with a clear explanation, a fully worked example, and self-check questions.

Practice at this level — free

Number & operations

Counting & cardinalityPlace value & the base-ten systemAddition & subtractionMultiplication & divisionProperties of operationsFactors & multiplesRounding & estimation

Fractions

Fractions: meaning & equivalenceComparing & ordering fractionsAdding & subtracting fractionsMultiplying fractionsDecimals & decimal place value

Measurement & data

Measurement (length, mass, volume, time)MoneyRepresenting & interpreting dataArea & perimeterVolume

Geometry

2D & 3D shapesLines, angles & symmetryThe coordinate plane (intro)

Algebraic thinking

Patterns & relationships