Yes.
real number
because ther is no decimal and negative sign in it
No, there is no smallest decimal number. Decimal numbers represent real numbers and between any two real numbers there are infinitely many other real numbers. So, there are infinitely many decimal numbers between 0 and your 1.21: each one will be smaller than 1.21
No, there is no smallest decimal number. Decimal numbers represent real numbers and between any two real numbers there are infinitely many other real numbers. So, there are infinitely many decimal numbers between 0 and your 1.02: each one will be smaller than 1.02
All real numbers have a decimal representation. Rational numbers have decimal representations that terminate or repeat infinitely. Irrational numbers have decimal representations that are non-terminating and non-repeating.
Decimals are real. They can be rational or irrational.
Any real number can be represented as a decimal number.
Any decimal number is a real number.
2 is a real number.
A real number. Or, the decimal representation of a real number.
Any real number has an equivalent decimal representation.
Any real number can be written as a decimal.