Rational number 12by14 in standard form

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$$\begin{gathered} A rational number is said to be in s\tan dard form when it is expressed in the form of \frac{a}{b}, where b \ne 0 and a and b are co-prime numbers. \\ Now, 12 and 14 aren\text{'}t co-prime numbers - they have a common factor 2. \\ \therefore \frac{12}{14} = \frac{6 \times \cancel{2}}{7 \times \cancel{2}} = \frac{6}{7}. \\ Thus, 6 and 7 are co-prime numbers \left(they have no common factor other than 1\right) and 7\ne 0. \frac{6}{7} is in s\tan dard form. \end{gathered}$$

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