Percent Proportion Review: Change, Error

$$\frac{part}{whole}=\frac{\%}{100}$$

Percent Error = $$\frac{|experimental value - theoretical value|}{theoretical value} \times 100$$ .

Patrick's percentage = $$\frac{13}{15} \times 100 = 86\%$$ .

Percent Change = $$\frac{new value - old value}{old value} \times 100$$ .

Percent Change = $$\frac{30 - 27}{27} \times 100 = 11\%$$ .

It means that 61.53% of the surveyed students chose math as their favorite subject.

It indicates that the experimental result deviated from the theoretical value by 3.6%.

Multiply the fraction by 100 and add a percent sign.

The part is a portion of the whole, and the percent represents how much of the whole the part is.

Percentage Score = $$\frac{80}{100} \times 100 = 80\%$$ .