Question

How do you write two decimals that are equivalent to `2.50`?

Answer 1

How about: `2.4dot9 and 0.25xx10^1`

Explanation:

(i) `2.4dot9` (read "2.4 9 recurring") is equivalent to 2.50 since rounding the infinite decimal at any finite point will result in `2.50`

(ii) `2.50` would not usually be written in scientific notation (as it is `2.5 xx 10^0`). However it could be written as `0.25 xx 10^1`