← everywhy
🍪 Fair Shares

What happens to the leftovers?

Share 13 cookies with 4 friends and one cookie is left over. Does it just get thrown away? Let’s deal them out, one at a time, and find out.

Start sharing ↓

Dividing is fair sharing.

Press Next step. Watch every cookie find a plate.

🍪 The cookie tableStep 1 of 6

Your turn: 5 sharing challenges

Deal fairly, count the leftovers, and share every last crumb.

🎯 Challenge0 of 5 done
⭐ You saw through the trap

A leftover is a share that isn’t whole yet.

13 ÷ 4 = 3 R 1deal: 3 each,
1 left over
4 × 3 + 1 = 13check: put it all back
3 and 14 eachcut the leftover
into 4 pieces

Division is fair sharing. Deal until there aren’t enough left to go round again: that’s the remainder, and it’s always smaller than the number of friends. Multiply back and add the remainder to check. And if the thing can be cut, the remainder becomes a fraction of a share: R 1 among 4 friends is 14 each.