Drag each image vertex to the lattice point a coordinate rule like (x, y) → (−y, x) sends it to — the transformed figure assembles vertex by vertex.
A pre-image sits on a four-quadrant grid and a coordinate rule such as (x, y) → (−x, y), (x, y) → (−y, x), (x, y) → (x + 3, y − 2) or (x, y) → (2x, 2y) is posted; the player drags each image vertex to the exact lattice point the rule produces, so the reflected, rotated, translated or dilated figure assembles one evaluated vertex at a time. Deduce rounds hide the rule and give only A → A′, and Undo rounds show the image and ask for the pre-image, so the player runs the rule backwards. It targets the sign-and-swap slips behind rotations (confusing (−y, x) with (y, −x)) and the habit of treating a dilation as a slide. Best for Grade 8.
A free, no-signup, no-ads math game for Grade 8 — practising transformations, coordinate-plane, reflection, rotation, translation, dilation. Play in your browser on the KidsDoMath games hub or explore more Geometry & Shapes games.
By grade level: 8th Grade Math Games
More like this: Triangle BuilderDilation DockPi Pizzeria
What math does Coordinate Rule Reactor practice? Coordinate Rule Reactor practices Transformations, Coordinate Plane, Reflection, Rotation. A pre-image sits on a four-quadrant grid and a coordinate rule such as (x, y) → (−x, y), (x, y) → (−y, x), (x, y) → (x + 3, y − 2) or (x, y) → (2x, 2y) is posted; the player drags each image vertex to the exact lattice point the rule produces, so the reflected, rotated, translated or dilated figure assembles one evaluated vertex at a time.
What grade is Coordinate Rule Reactor for? Coordinate Rule Reactor is built for Grade 8 (ages 13–14). It sits in the Geometry & Shapes strand, and it ramps across 8 levels so younger or older players find their own pace.
How do you play Coordinate Rule Reactor? Drag each image vertex to the lattice point a coordinate rule like (x, y) → (−y, x) sends it to — the transformed figure assembles vertex by vertex.
Is Coordinate Rule Reactor free to play? Yes. Coordinate Rule Reactor is free, with no ads and no sign-up, and it runs in the browser on a phone, tablet or computer.