Yes, all quantities in our real life are real numbers (including integers, infinite decimals, fractions and negative numbers). But there is another number, the imaginary number, which is represented by the letter I, and its calculation origin is I 2 =-1,that is, i×i=- 1, so I has no practical significance and does not need any quantity in real life.

There are also positive infinity (+∞) and negative infinity (-∞). Generally speaking, infinity only exists in mathematical calculation, or in the physical speculation theory of "infinite gravity of black holes", and it is difficult to touch the infinite quantity in real life.