Dial a cylinder's, cone's or sphere's radius or height until the solid holds exactly the target volume — the shape grows under the dial while you work the formula in terms of π.
A target volume such as 48π is the hero; one dimension is fixed and the player dials the other while the cylinder, cone or sphere visibly grows or shrinks, with the formula shown filled in (π · 4² · h) but left for the player to evaluate. Cone rounds carry the one-third as a scoop (tap the cone to pour it into its same-base cylinder — three scoops fill it), sphere rounds sit inside their r × 2r cylinder, and the final level interleaves all three solids so the formula must be chosen first. It targets forgetting the ÷ 3 and the r² versus r³ mix-up. Best for Grades 7–8.
A free, no-signup, no-ads math game for Grade 8 — practising volume, cylinder, cone, sphere, pi. Play in your browser on the KidsDoMath games hub or explore more Measurement games.
By grade level: 8th Grade Math Games
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What math does Round Volume Vault practice? Round Volume Vault practices Volume, Cylinder, Cone, Sphere. A target volume such as 48π is the hero; one dimension is fixed and the player dials the other while the cylinder, cone or sphere visibly grows or shrinks, with the formula shown filled in (π · 4² · h) but left for the player to evaluate.
What grade is Round Volume Vault for? Round Volume Vault is built for Grade 8 (ages 13–14). It sits in the Measurement strand, and it ramps across 8 levels so younger or older players find their own pace.
How do you play Round Volume Vault? Dial a cylinder's, cone's or sphere's radius or height until the solid holds exactly the target volume — the shape grows under the dial while you work the formula in terms of π.
Is Round Volume Vault free to play? Yes. Round Volume Vault is free, with no ads and no sign-up, and it runs in the browser on a phone, tablet or computer.