In the grid below, $\frac{4}{28}$428 parts have been shaded. Use the grid to simplify $\frac{4}{28}$428.
A rectangular grid composed of $4$4 rows and $7$7 columns of equal-sized squares. Each row has $1$1 square shaded in blue. The squares are outlined in green.
In the grid below, $\frac{20}{32}$2032 parts have been shaded. Use the grid to simplify $\frac{20}{32}$2032.
In the grid below, $\frac{12}{24}$1224 parts have been shaded. Use the grid to simplify $\frac{12}{24}$1224.
Simplify the fraction $\frac{3}{9}$39.