number-bonds

phet.colorado.edu

Add numbers by making tens. Break apart and combine numbers while focusing on place value. Use the adding screen to add any two numbers. Use the game screen to apply your make-a-ten strategies!

phet.colorado.edu

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!