About Ratio and Proportion
Play with the left and right hands in different ways, and explore ratio and proportion. Start on the Discover screen to find each challenge ratio by moving the hands. Then, on the Create screen, set your own challenge ratios. Once you've found a challenge ratio, try to move both hands while maintaining the challenge ratio through proportional reasoning.
How to play Ratio and Proportion
Everything is hands-on: drag, click and experiment — the simulation reacts instantly. Play with the left and right hands in different ways, and explore ratio and proportion.
Questions & answers
- What is Ratio and Proportion?
- Ratio and Proportion is a free interactive simulation from PhET Interactive Simulations (University of Colorado Boulder) that you can play right in your browser on crumble.lol — no downloads and no sign-up. Play with the left and right hands in different ways, and explore ratio and proportion. Start on the Discover screen to find each challenge ratio by moving the hands.
- What can kids learn from Ratio and Proportion?
- It helps kids explore: understand the concept of a ratio and use ratio language to describe a ratio relationship between two hand heights. understand the concept of a unit rate a/b associated with a ratio a:b, and use rate language in the context of a ratio relationship. recognize and represent proportional relationships between hand heights.
- What age is Ratio and Proportion good for?
- It is designed for elementary school (roughly ages 5–10) up to middle school (roughly ages 10–14), and curious kids outside that range can absolutely enjoy poking around it too.
- Is Ratio and Proportion free to play?
- Yes — Ratio and Proportion is completely free on crumble.lol and runs fully in your browser on computers and tablets.