The power of Estimation

earth

1. Imagine a piece of rope tied around the Earth, about 40,000 kilometres long.

Now imagine another piece of rope tied around the Earth, but 1 metre above the ground.

Don't do a calculation. Just quickly estimate how much more rope is needed?

Which one would be the nearest extra rope required?

  10000km  1000km  100km  1km  100m  10m


2. Estimate the following question within 5 seconds:

"Given a piece of paper 0.1mm thick, estimate how thick the paper would be if it were folded on itself 100 times?"