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Yes, 1.23 is a rational number because it can be expressed as a fraction of two integers, specifically 123/100. In general, a rational number is any number that can be written as a fraction where the numerator and denominator are integers and the denominator is not zero. Since 1.23 fits this definition, it is considered a rational number.
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Is 0.123 rational or irrational?
0.123 is the ratio of 123 to 1,000 so it's rational.
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What is a rational number number which is not a rational number?
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Is a rational number plus a rational number always a rational number?
Yes, it is.
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