# Current Problems of the Week

## PrimaryNumber Fun
- January 19
Use clues to help Dominic solve a number riddle. |
## AlgebraSierpinski Stages
- January 12
Find and use patterns to determine the perimeter of an interesting shape. Preview: Battle of the Bands |

## Math FundamentalsPenny Dates
- January 12
Discover which date can change a collection's mean date by one year. Preview: Filling Beauty's Seats |
## GeometryLatest Solution: How Deep Is It? |

## Trig & CalculusTime to Make the Doughnuts
- January 12
How can calculus help you create a donut to your boss's specifications? Preview: Stonybrooke River Bridge |