This challenge presents four different kinds of problems which cover estimation of time, dealing with large numbers, estimation of volume, and using shapes. Each challenge gives a hint and how the problem applies to real life situations. After you’ve hashed and rehashed your explanations of each problem, you can look at the detailed answer which will give you even more to think about. And that’s just for the first set of four. There are twenty sets, providing a lot of practice.
courtesy of Knovation