Numbered meteors rain on a row of cities labelled with tens, hundreds or thousands — tap the city each number rounds to and your interceptor launches from it to meet the meteor.
Round Defense plays like Missile Command: numbered meteors fall toward a row of cities labelled 40, 50, 60 (later hundreds, then thousands), and the child fires from the city each number rounds to. A wrong city lets the meteor through — it drops onto its true spot on the ground number line and slides to the city it really rounds to, with a one-line teach about the halfway point — so the round-half-up rule and the classic slip of reading the wrong digit (349 vs 351) are corrected inside the action. Best for Grades 3–4.
A free, no-signup, no-ads math game for Grades 3–4 — practising rounding, nearest-ten, nearest-hundred, nearest-thousand, round-half-up. Play in your browser on the KidsDoMath games hub or explore more Arithmetic games.
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What math does Round Defense practice? Round Defense practices Rounding & Estimation, Nearest Ten, Nearest Hundred, Nearest Thousand. Round Defense plays like Missile Command: numbered meteors fall toward a row of cities labelled 40, 50, 60 (later hundreds, then thousands), and the child fires from the city each number rounds to.
What grade is Round Defense for? Round Defense is built for Grades 3–4 (ages 8–10). 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 Round Defense? Numbered meteors rain on a row of cities labelled with tens, hundreds or thousands — tap the city each number rounds to and your interceptor launches from it to meet the meteor.
Is Round Defense free to play? Yes. Round Defense is free, with no ads and no sign-up, and it runs in the browser on a phone, tablet or computer.