Cut the rows that give one input two outputs, drag table points onto a grid to route it linear or nonlinear, and dial a line's rate of change straight off the table.
A relation arrives as a table with a mapping diagram; the player cuts rows until every input keeps exactly one output, then drags each row's point onto a grid and routes the table to LINEAR or NONLINEAR, and finally dials the rate of change so a line through the table's first point fits the rest. It drills the definition of a function (8.F.1), reading linear vs nonlinear from constant Δy ÷ Δx (8.F.5), and computing and comparing rates (8.F.2). It targets the misconception that a repeated output breaks a function, when only a repeated input does. Best for Grades 7–8.
A free, no-signup, no-ads math game for Grade 8 — practising functions, linear-functions, rate-of-change, function-tables. Play in your browser on the KidsDoMath games hub or explore more Coordinates & Algebra games.
By grade level: 8th Grade Math Games
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What math does Function Filter practice? Function Filter practices Functions, Linear Functions, Rate of Change, Function Tables. A relation arrives as a table with a mapping diagram; the player cuts rows until every input keeps exactly one output, then drags each row's point onto a grid and routes the table to LINEAR or NONLINEAR, and finally dials the rate of change so a line through the table's first point fits the rest.
What grade is Function Filter for? Function Filter is built for Grade 8 (ages 13–14). It sits in the Coordinates & Algebra strand, and it ramps across 8 levels so younger or older players find their own pace.
How do you play Function Filter? Cut the rows that give one input two outputs, drag table points onto a grid to route it linear or nonlinear, and dial a line's rate of change straight off the table.
Is Function Filter free to play? Yes. Function Filter is free, with no ads and no sign-up, and it runs in the browser on a phone, tablet or computer.