Freeflows
All Problems
Prealgebra
Number
Theory
Counting and Probability
Precalculus
Geometry
Algebra
Intermediate Algebra
| Status | Title | Difficulty |
| 501. Single Zero Numbers | Level 5 | |
| 502. Simultaneous Data Backup | Level 3 | |
| 503. Radical Product Evaluation 1 | Level 3 | |
| 504. Nonagon Diagonals Count | Level 4 | |
| 505. Even Integer Count | Level 2 | |
| 506. Polygon Side Calculation | Level 5 | |
| 507. Balloon Height Calculation | Level 3 | |
| 508. Tiny Fraction Approximation | Level 4 | |
| 509. Card Drawing Probability | Level 5 | |
| 510. Test Score Average | Level 5 | |
| 511. Arithmetic Operation Simplification | Level 1 | |
| 512. Odd Digit Integer Count 2 | Level 5 | |
| 513. Office Position Selection | Level 3 | |
| 514. Negative Root Squaring | Level 2 | |
| 515. Class Average Calculation | Level 3 | |
| 516. Decimal Division | Level 2 | |
| 517. Algebraic Equation Solving 4 | Level 2 | |
| 518. Exponential Expression Calculation 2 | Level 3 | |
| 519. Relatively Prime Integer Search | Level 5 | |
| 520. Cookie Ratio Scaling | Level 2 |