Computation uses Real Number Operations such as opposite, reciprocals, absolute values, raising a power and taking a root.
Estimation uses estimation in calculations and determines reasonableness, as appropriate.
Show there must have been a misprint, and suggest two specific places the misprint might have occurred. Compare .00135 with 1.3 x 10-3 . Explain why the difference between the squares of two consecutive numbers is an odd number. A news story says that a person in Australia has written out all the whole numbers from l to 1,000,000. Figure out how many pages this might take up.