Is 1.25 a rational number and why?

Answer 1

Yes, 1.25 is a rational number because it can be expressed as a fraction in the form of a/b, where a and b are integers and b is not equal to zero. In this case, 1.25 can be written as 5/4, which fits the definition of a rational number. Rational numbers include all integers, fractions, and terminating or repeating decimals.

Answer 2

A rational number is one that can be written in the form of one whole number over another whole number.

1.25 = 125/100 which is one whole number over another whole number.

Thus 1.25 is a rational number.

---------------------------------------------------------------------------------------------------

If p and q are integers with q ≠ 0, then p/q is a rational number.

The decimal expansion of a rational number either terminates or ends with a repeating sequence of one or more digits (this latter occurring when there is a prime factor other than 2 and/or 5 in the denominator).

Answer 3

It is rational.* A rational number is one that either has a finite number of decimals, or a repeating pattern. In this case, finite.

* A rational number is also one that can be written as a fraction, with integers on the top and the bottom (this is the usual definition of a rational number). In this case, 125/100.