Practice
20.5 millionEndless problems made on demand, each with an exactly computed answer. Every click is a new one.
Curated
11| # | Title | Difficulty | Source | Tags | |
|---|---|---|---|---|---|
| 91 | Times ninety-nine | Easy | Lemma | ||
| 92 | Squares ending in five | Easy | Lemma | ||
| 102 | Gauss in the schoolroom | Easy | Classical | ||
| 232 | Times twenty-five | Easy | Lemma | ||
| 233 | Almost a thousand | Easy | Lemma | ||
| 234 | Times one hundred and one | Easy | Lemma | ||
| 235 | Forty-nine squared | Easy | Lemma | ||
| 236 | Making change | Easy | Lemma | ||
| 237 | One hundred twenty-five | Easy | Lemma | ||
| 238 | Around sixty-five | Medium | Lemma | ||
| 1092 | GCM in septenary base | Medium | Hall & Knight |