How many sweets in the jar? How long is that wall? Estimation is a game when you keep score — beat your previous guess each round.
You try
A jar is 20 cm tall and a layer of sweets is about 1 cm deep, with roughly 12 sweets per layer. Estimate the total number of sweets.
How to estimate well
- Anchor to something you know ('I'm 1.7 m; that wall is about 5 of me ⇒ ≈ 8.5 m').
- Break it up — estimate one layer/row, then count layers/rows.
- Round the inputs to easy numbers; precision isn't the point.
- Bracket it: give a low guess and a high guess — the truth should sit between them.
Your turn
Estimate how many times your heart beats in a day. (≈70 beats per minute.)
Anchor with something you DO know. 'I'm 1.7m, that wall is about 5 of me, so ≈ 8.5m.' Anchoring beats guessing every time.