Question

Is 0.8 a rationol number

Answer 1

Hello.

The answer is: yes

A rational number is any number that can be repesented as a fraction. So every integer is also a rational number (because it can be written as a fraction with the denominator 1)

Have  a nice day

Answer 2

Yes because (i) it’s decimal number with a finite number of decimals and (ii) you can write it as a fraction, see pic.