Simplify Fraction: Simplify the fraction42 to its lowest terms.Calculation: 2÷2=1 and 4÷2=2, so 42 simplifies to 21.
Check Rational Number: Determine if 21 is a rational number.Reasoning: A rational number can be expressed as a fraction where both the numerator and the denominator are integers, and the denominator is not zero.21 meets these criteria (numerator = 1, denominator = 2).
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