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What is the rational number between 
(1)/(2) and 
(1)/(3)?

What is the rational number between 12 \frac{1}{2} and 13? \frac{1}{3} ?

Full solution

Q. What is the rational number between 12 \frac{1}{2} and 13? \frac{1}{3} ?
  1. Identify fractions: Identify the two fractions between which we need to find a rational number.
  2. Average calculation: Understand that to find a rational number between two fractions, we can simply find the average of the two fractions by calculating \frac{\text{fraction}_1 + \text{fraction}_2}{2}.
  3. Calculate average: Calculate the average of the two fractions (12)(\frac{1}{2}) and (13)(\frac{1}{3}) by adding them together and dividing by 22.\newlineAverage = (12+13)/2\left(\frac{1}{2} + \frac{1}{3}\right) / 2
  4. Find common denominator: Find a common denominator for the fractions to add them together. The common denominator for 22 and 33 is 66.(12)(\frac{1}{2}) becomes (36)(\frac{3}{6}) and (13)(\frac{1}{3}) becomes (26)(\frac{2}{6}).
  5. Add fractions: Add the two fractions with the common denominator.\newline(36)+(26)=(56)(\frac{3}{6}) + (\frac{2}{6}) = (\frac{5}{6})
  6. Divide sum: Divide the sum by 22 to find the average.\newline(56)/2=(56)(12)=(512)\left(\frac{5}{6}\right) / 2 = \left(\frac{5}{6}\right) \cdot \left(\frac{1}{2}\right) = \left(\frac{5}{12}\right)
  7. Check validity: Check if (512)(\frac{5}{12}) is indeed between (12)(\frac{1}{2}) and (13)(\frac{1}{3}).\frac{1}{3} < \frac{5}{12} < \frac{1}{2} is true because 13=412\frac{1}{3} = \frac{4}{12} and 12=612\frac{1}{2} = \frac{6}{12}.

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