Question

if I ate 4/9 of a box of cereal what is the fraction of the cereal left?

Answer 1

if the whole of a cereal is 1

you ate 4/9

1 - 4/9 = remainder

$1-\frac{4}{9}$$\frac{9-4}{9}=\frac{5}{9}$$so\text{ }\frac{5}{9}\text{ of the cereal is left}$