Practice
8,160Endless problems made on demand, each with an exactly computed answer. Every click is a new one.
Curated
8| # | Title | Difficulty | Source | Tags | |
|---|---|---|---|---|---|
| 653 | Ages in twenty years | Easy | Lemma | ||
| 655 | Three in a row | Easy | Lemma | ||
| 656 | Heads and legs | Easy | Lemma | ||
| 657 | Half of it plus ten | Easy | Lemma | ||
| 658 | Up fifty, down fifty | Easy | Lemma | ||
| 660 | Digging together | Easy | Lemma | ||
| 654 | The fly and the trains | Medium | Classical | ||
| 659 | Counting digits | Medium | Lemma |