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Is the following number rational or irrational?

0.5555
Choose 1 answer:
(A) Rational
(B) Irrational

Is the following number rational or irrational?\newline0.55550.5555\newlineChoose 11 answer:\newline(A) Rational\newline(B) Irrational

Full solution

Q. Is the following number rational or irrational?\newline0.55550.5555\newlineChoose 11 answer:\newline(A) Rational\newline(B) Irrational
  1. Evaluate decimal 0.55550.5555: Evaluate the decimal 0.55550.5555 to determine if it can be expressed as a fraction of two integers, which is the definition of a rational number.\newline0.55550.5555 is a repeating decimal, where the digit 55 repeats indefinitely.\newlineThis repeating decimal can be expressed as a fraction, where the numerator is the repeating digit(s) and the denominator is the same number of 99s as there are repeating digits.\newlineIn this case, 0.55550.5555 can be written as 55559999\frac{5555}{9999}.
  2. Expressing repeating decimal as a fraction: Simplify the fraction 55559999\frac{5555}{9999} if possible to check for any common factors.\newlineBoth the numerator and the denominator are divisible by 55.\newlineDividing both by 55 gives us 11111999\frac{1111}{1999}.\newlineThis is the simplified form of the fraction, indicating that 0.55550.5555 can indeed be expressed as a fraction of two integers.
  3. Simplifying the fraction: Conclude whether 0.55550.5555 is rational or irrational based on the previous steps.\newlineSince 0.55550.5555 can be expressed as the fraction 11111999\frac{1111}{1999}, it meets the definition of a rational number.\newlineTherefore, 0.55550.5555 is a rational number.

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