Friend Pop
The card shows a number. Pop the balloon that makes 5 (or 10) with it. No timer, no lives.
How to play
Tap the balloon with the right number, or press that number on the keyboard. If you pick the wrong one it wobbles and stays, so you can try again. Find twelve friends to finish.
Why friends matter
On the abacus, when there are not enough beads to add, you use a friend: to add 4 you can add 5 and take away 1, because 4 and 1 are friends of 5. To add 9 you add 10 and take away 1, because 9 and 1 are friends of 10. Children who know the friend pairs by heart find the small and big friends lessons much easier.