Prime Time
| Investigation | Link |
| Multiplication Skills | Argonne National Laboratory: ArithmAttack |
| Learning Planet: Math Mayhem | |
| Learning Planet: Spacey Math | |
| 1 - The Factor Game | NCTM: The Factor Game |
| Math Frog: The Grid Game | |
| 3 - Factor Pairs | Project Interactive: Factorize |
| Project Interactive: Factorize 2 | |
| Virtual Manipulative: Rectangle Multiplication | |
| 4 - Common Factors and Multiples | Virtual Manipulative: Sieve of Eratosthenes |
| NCTM: The Product Game | |
| 5 - Factorizations | Virtual Manipulative: The Factor Tree |