Drive a rover one signed jump card at a time — negative fractions and decimals, left and right across zero — so the sum is simply where it stops.
Adding and subtracting rational numbers as motion on a number line whose ticks are the common denominator: each signed jump card (−3/4, +1/2, −0.7) is driven by dragging the rover the right number of ticks in the right direction, and the sum is where it stops. Subtraction cards must be flipped into adding the opposite before they can be driven, and the inverse mode asks for the one jump from a start to a flag (p − q). Targets the 'subtracting a negative moves left' and mixed-denominator misconceptions with misses that name the next move. Best for Grades 7–8.
A free, no-signup, no-ads math game for Grade 7 — practising rational-numbers, negative-numbers, fractions, decimals, addition, subtraction, number-line. Play in your browser on the KidsDoMath games hub or explore more Arithmetic games.
By grade level: 7th Grade Math Games
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What math does Rational Rover practice? Rational Rover practices Rational Numbers, Negative Numbers, Fractions, Decimals. Adding and subtracting rational numbers as motion on a number line whose ticks are the common denominator: each signed jump card (−3/4, +1/2, −0.7) is driven by dragging the rover the right number of ticks in the right direction, and the sum is where it stops.
What grade is Rational Rover for? Rational Rover is built for Grade 7 (ages 12–13). It sits in the Arithmetic strand, and it ramps across 8 levels so younger or older players find their own pace.
How do you play Rational Rover? Drive a rover one signed jump card at a time — negative fractions and decimals, left and right across zero — so the sum is simply where it stops.
Is Rational Rover free to play? Yes. Rational Rover is free, with no ads and no sign-up, and it runs in the browser on a phone, tablet or computer.