Why do tiny things grow huge?
A rumor/chain message spreading through a class: each kid tells 2 friends, who each tell 2 more — looks like nothing for a few rounds, then the whole school knows by lunch. Or paper-folding (each fold doubles the layers). Money/allowance framing already present.
Talk about it
- Before we look — guess who wins after 30 days: the penny that doubles, or the steady $1,000-a-day pile?
- The penny looks hopeless for almost three weeks. Why do you think it suddenly catches up so fast?
- Can you think of something at home that grows a little bit of itself each time, like the penny does?