Let's look at a fraction where the denominator is not 100. Here, a square has been split into 10 equal-sized rectangles. It is split into tenths. \(\frac {7} {10}\) of the square is shaded.

So if 2 out of 6 slices have been eaten, there are 4 slices left. You can write this as 4⁄₆ What fraction of squares aren’t red? Count how many there are. 6 squares are not red, so therefore ...