Because there are numerical values which cannot be expressed as ratios of two integers. That is, there are numbers that are not rational.
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Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
All natural numbers are rational numbers. No irrational numbers are natural numbers.
no. irrational numbers are square roots of numbers that aren't square, pi, and some other numbers. irrational means it never ends.
0.1121231234(not repeating) is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Irrational numbers are real numbers because they are part of the number line.