Good Guessing - That's What Estimation's All About

Hooray for our estimating, now we have a jar of 730 jellybeans to enjoy.

This how we made our Good Guess

1. We looked at the bottom of the glass jar and counted the number of jellybeans on the bottom layer.
2. We measured (using a bendy ruler) the height of the jar.
3. We measured the amount of space the bottom layer took up.
4. We worked out how many layers there were in the jar by dividing the height by the height of one layer.
5. We multiplied the number of jellybeans in the bottom layer by the number of layers we estimated there were.

We were only 14 out!