Concepts practice

Pick a topic. Each round is a short set of multiple-choice questions with a picture-first explanation on every reveal — see why each identity is true.

Table of Parts — squares of sums & the box method 25 questions · grades 6-8 Square of a Sum — (a+b)² and the two twins 25 questions · grades 6-8 Snip Anywhere — identities vs equations 25 questions · grades 6-8 The Dreamer's Dream — why (a+b)² ≠ a²+b² 25 questions · grades 6-8 Square of a Difference — the double-counted corner 25 questions · grades 6-8 Difference of Squares — Slyde's cut-and-slide 25 questions · grades 6-8 Trinomial Square — the viral 3×3 tile 25 questions · grades 6-8 Find the Rectangle — factoring by the box, run backward 25 questions · grades 6-8 Bustan's Garden — completing the square 25 questions · grades 6-8 Cube of a Sum — Trilo's 1-3-3-1 25 questions · grades 6-8 Cubes — sum, difference, and (a−b)³ 25 questions · grades 6-8 Numbers as Shapes — mental squaring 25 questions · grades 6-8 Proof Ladder — evidence vs proof 25 questions · grades 6-8 Pascal's Rows — the coefficient triangle 25 questions · grades 6-8 Identity Duel — mixed review 25 questions · grades 6-8 Bảy hằng đẳng thức — the seven remarkable identities (VN Toán 8) 25 questions · grades 6-8

Every answer is checked by a deterministic engine. On-device · no accounts · nothing leaves the device.