Yes. Any number that you can write down on paper with digits, and then show
it to somebody and say "There it is, that's it, that's the complete number." is a
rational number.
5.4 is the ratio of 54 to 10, and can be written as 54/10, so it satisfies the
definition of rational numbers.
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5.4 Outline
Introduction
definition of a rational number
numerator
denominator
classification
proper fraction
improper fraction
whole number
Fundamental property
Operations with rationals
addition
subtraction
multiplication
division
5.4 Essential Ideas
This section, which may be review, is concerned with the rational numbers (fractions) and operations with rational numbers. You must remember the definition of a rational number, the fundamental property of fractions (how to reduce a rational number):
It is a rational number. It can be written as a fraction.
It is a rational number, as it can be written as a fraction.
Yes, the sum is always rational.
10.01 is a rational number
Since it can be written as a fraction (9.0 = 90/10), then it 9.0 is a rational number.