Question 351920
Natural numbers: 1, 2, 3, ...
Whole numbers: 0, 1, 2, 3, ...
Integers: ..., -3, -2, -1, 0, 1, 2, 3, ...
Rational: Any number that can be expresses as a ratio of integers.
Irrational: Numbers that cannot be expresses as a ratio of integers.<br>
{{{sqrt(25)}}}
This simplifies to 5. And 5 is in <i>all</i> of the above sets except irrational!