What is 22 as a decimal?

Answer 1

That already is a decimal number. If you want decimal digits after a decimal point, you can also right it as 22.0, 22.00, etc. - but that is usually optional, except in some programming languages, where you need to distinguish different number types.

Answer 2

It is 22, exactly as in the question.
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. Adding zeros after the decimal point is wrong because they imply a degree of accuracy (significant figures) for which there is no justification.

Answer 3

It is simply 22.0.

Answer 4

write in two other ways : 22% or 2.2