@lyxal doing both isn't a bad idea but if you have to pick one i'd suggest first second third because you can get 1st 2nd 3rd from 1 2 3 plus the last two letters
There's consensus that answering with fractions is allowable for decimals that can be expressed as fractions. But what about irrational numbers? Can they be expressed as a rational representation of the corresponding decimal approximation?
Examples:
\$\sqrt{2}\$ can be approximated as \$1.4142135...