the table shows the number of students in each grade at prairie middle school. in the 8th grade…

the table shows the number of students in each grade at prairie middle school. in the 8th grade, $\frac{4}{5}$ of students study chemistry. how many students in the 8th grade study chemistry? 100 students how many students are in the 8th grade? 100 students how do you find $\frac{4}{5}$ of a number? first, find $\frac{1}{5}$ of the number by dividing the number by? then multiply the result by?

the table shows the number of students in each grade at prairie middle school. in the 8th grade, $\frac{4}{5}$ of students study chemistry. how many students in the 8th grade study chemistry? 100 students how many students are in the 8th grade? 100 students how do you find $\frac{4}{5}$ of a number? first, find $\frac{1}{5}$ of the number by dividing the number by? then multiply the result by?

Answer

Explanation:

Step1: Identify the total number of 8th - grade students

The table shows there are 100 students in 8th grade.

Step2: Determine the fraction of students studying chemistry

The fraction of 8th - grade students studying chemistry is $\frac{4}{5}$.

Step3: Calculate the number of 8th - grade students studying chemistry

To find $\frac{4}{5}$ of 100, first find $\frac{1}{5}$ of 100. Since $\frac{1}{5}$ of a number is found by dividing the number by 5, $100\div5 = 20$. Then, to find $\frac{4}{5}$ of the number, we multiply the result by 4. So $20\times4=80$. Also, we can directly calculate $\frac{4}{5}\times100=\frac{4\times100}{5}=80$. To find $\frac{4}{5}$ of a number: First, find $\frac{1}{5}$ of the number by dividing the number by 5. Then multiply the result by 4.

Answer:

  1. 80 students in the 8th grade study chemistry.
  2. There are 100 students in the 8th grade.
  3. First, find $\frac{1}{5}$ of the number by dividing the number by 5. Then multiply the result by 4.