Unit 1, Day 2

Agenda

1. Number talk: Estimation Duels — $100$ m in $10$ s: how fast in km/h? Closest estimate, no calculator, wins
2. Random groups: back to your tables from How Fast Right Now? — shrink the interval again, and again; record what the averages do
3. Discuss: being stuck was the plan — Why Struggle Is the Point, and Getting Unstuck when you want a nudge, not an answer
4. Consolidate: an average rate is a secant’s slope — and the value the shrinking secants chase has no name. Yet.

Things to do before our next class

• Read What a Strong Entry Looks Like, then upgrade your first entry before it fossilises.
• Worried already? Do not be — but Getting Help lists every route back in anyway.