The ratio is linked to parts of a fraction – it states the parts of the whole (4 parts, 5 parts, 2 parts). The total number of parts in the ratio is 4 + 5 + 2 = 11. This gives the denominator of ...

Each part is one quarter. Look at the fractions when each part is shaded. Which fraction is the biggest? The fraction is larger if the numerator is a bigger number. So, 3 4 is the biggest.