Decimal to Fraction

A decimal already is a fraction; you just have to read it aloud. 0.24 is twenty-four hundredths, because its last digit sits in the hundredths place. So $0.24$ is $\frac{24}{100}$. The last digit's place names the bottom: tenths give 10, hundredths give 100, thousandths give 1000.

Then simplify, as you did in the fractions section: divide the top and the bottom by their greatest common factor. 24 and 100 share a factor of 4, so $\frac{24}{100}$ becomes $\frac{6}{25}$. 6 and 25 share no factor except 1, so the fraction is in lowest terms.

Why bother simplifying? $\frac{6}{25}$ and $\frac{24}{100}$ are the same number, but the lowest form is the one people expect to read, and the board finishes a fraction task only in lowest terms. It is also the easiest to picture: 6 parts out of 25.