what would it be if you took 324.76 and tryed to make it notation and in decimals and fractions

3.2476 x 10^2 and

324 76/100

324.76 is already in decimal form. As a fraction (mixed number), it is
324 76/100, which can be reduced to 324 19/25

In scientific notation, it is
3.2476 *10^2