Here’s a simple number game to play on a rainy day, or while sheltering in place. You and I take turns crossing out numbers from the list {1, 2, 3, …, 9}. The winner is the last person to cross out a ...

This pattern-based thinking extends beyond simple hundreds. Numbers like 180 feet (60 yards) or 450 feet (150 yards) become manageable when you develop an eye for mathematical relationships.