Math Problem Solver

\[\frac{12.9}{3} = \frac{43}{10} = 4.3\]

\[\begin{aligned}\frac{12.9}{3}& = \left(12 + \frac{9}{10}\right) \cdot \frac{1}{3}\\& = \frac{129}{10} \cdot \frac{1}{3}\\& = \frac{43}{10}\end{aligned}\]