can 21 over 56 be simplified?
\(21|3\\.\ 7|7\\.\ 1|\\21=3\cdot7\\\\56|2\\28|2\\14|2\\.\ 7|7\\.\ 1|\\56=2\cdot2\cdot2\cdot7\\\\\frac{21}{56}=\frac{3\cdot7}{2\cdot2\cdot2\cdot7}=\frac{3}{2\cdot2\cdot2}=\boxed{\frac{3}{8}}\)