About Number Pairs
Create number pairs to compose, decompose, and add numbers from 0-20 in multiple contexts. Play with magic beads and kittens that can change color! Add numbers on a number line!
How to play Number Pairs
Everything is hands-on: drag, click and experiment — the simulation reacts instantly. Create number pairs to compose, decompose, and add numbers from 0-20 in multiple contexts.
Questions & answers
- What is Number Pairs?
- Number Pairs 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. Create number pairs to compose, decompose, and add numbers from 0-20 in multiple contexts. Play with magic beads and kittens that can change color!
- What can kids learn from Number Pairs?
- It helps kids explore: decompose numbers less than or equal to 10/20 into pairs in more than one way. interpret a number pair representation and explain the representation. describe the decomposition of a number based on either the attribute or the location of objects. describe a number less than or equal to 10/20 as a sum (or decomposition) of two numbers. determine the unknown whole number in an implied or explicit addition or subtraction problem relating three whole numbers.
- What age is Number Pairs good for?
- It is designed for elementary school (roughly ages 5–10), and curious kids outside that range can absolutely enjoy poking around it too.
- Is Number Pairs free to play?
- Yes — Number Pairs is completely free on crumble.lol and runs fully in your browser on computers and tablets.