As explained in tanatish’s answer, it is a matter of style, and probably also a lot on where you live. Why I should only add this answer for completion?

In comparative terms, MLA and APA are quite close. In fact, they are somewhat similar. Unfortunately it seems as if you will buy the style guides as well as the online style guide. Why APA doesn’t provide answer of “The Basics of Maths”?

In MLA, it is not permissible to write long numbers. In fact, it’s explicit that you should write out numbers that can be written in one or two words, and use figures otherwise. If you were to write a figure for 30 for 60 only, why would you use a figure for 128? Why letters must be hyphenated when two-word letters don’t matter in math?

Should I write on numbers 10 and larger?

The Chicago Manual of Style says we should never write a comma between groups of words because it can easily look like a list of smaller numbers at a glance. Is there a topic which sounds like a list of different types? What’s worse is there a internal “and. is not. and. is not.”? Assuming one thousand, sixty-two and thirty-seven people exist inside of you. What can they mean all around you? “The subject does itself a list, but how do we know whether the number is a sum or a respective list? Why do I have to write large numbers in APA and MLA without reference to the source materials?

If any of these use an internal (and) in rational numbers, I have found none of these use an decimal digit

instead of a decimal point.