Question

Is the number 128.439 a rational number

Answer 1

The number 128.439 is a rational number

Answer 2

Yes

Explanation:

Yes terminating and repeating decimals are rational numbers.

This is a terminating decimal. It ends, so it is rational.

Anything that can be written as a fraction where the top and bottom are integers is rational.

Some examples:

-1 =-1/1

5 =5/1

5.23 =523/100

.3333333333333333333333333333333333333....=1/3

1 2/3 =5/3

Since there seems to be more that need convincing, the number 128.439 can be written as 128439/1000

that is a fraction where the top and bottom are integers

so 128.439 is rational