3/10 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
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3/12 = 1/4 = 0.25, which terminates, so it is a rational number.
-3
0.3=3/10, a ratio of two integers, hence rational
Sqrt(2) is irrational. Multiply by sqrt(4.5). Result is 3 which is rational.
2/3 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.