Q. What is the rational number between 21 and 31?
Identify fractions: Identify the two fractions between which we need to find a rational number.
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}.
Calculate average: Calculate the average of the two fractions (21) and (31) by adding them together and dividing by 2.Average = (21+31)/2
Find common denominator: Find a common denominator for the fractions to add them together. The common denominator for 2 and 3 is 6.(21) becomes (63) and (31) becomes (62).
Add fractions: Add the two fractions with the common denominator.(63)+(62)=(65)
Divide sum: Divide the sum by 2 to find the average.(65)/2=(65)⋅(21)=(125)
Check validity: Check if (125) is indeed between (21) and (31).\frac{1}{3} < \frac{5}{12} < \frac{1}{2} is true because 31=124 and 21=126.