Street 05 › Arcade & Skill Lab › Ratio Reactor
⚗️ Ratio Reactor
Mix coolant in the right ratio. Scale a recipe up, find an equivalent ratio, or share a total between two tanks.
Free to play in your browser: no download and no account needed. The game opens on this page.
- Type
- Maths
- Difficulty
- Medium
- Round length
- 60s+
- Ages
- 11+
- Controls
- Tap an answer · Keys 1–4
What it practises
- Maths calculation: Arithmetic, fractions, ratios, powers and number bases at a steady pace.
- Concepts & theory: The science and maths behind the game: reflection, orbits, waves, circuits, ciphers.
Games are good for calculation speed and accuracy. Mathematical concepts still need teaching and explanation.
Quick lesson: Ratios scale by multiplying
A ratio like 2 : 3 is a recipe: for every 2 blue there are 3 green. To make more, multiply both sides by the same number (2 : 3 = 4 : 6 = 6 : 9). Adding the same amount to both sides changes the mix.
Check question
A recipe is 2 : 5. You use 6 blue. How much green?
- 9
- 10
- 15
- 30
Answer: 15. 6 ÷ 2 = 3 batches, and 5 × 3 = 15. (9 comes from adding 4 to both sides, which changes the ratio.)
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