Question

choose tools use a model to answer the question. use a proportion to check your answer. what number is 20% of 80? the number \square is 20% of 80.

Explanation:

Step1: Convert percentage to decimal

To find a percentage of a number, we first convert the percentage to a decimal. 20% is equivalent to $0.20$ (since $20\%=\frac{20}{100} = 0.20$).

Step2: Multiply the decimal by the number

We need to find 20% of 80, so we multiply 0.20 by 80. The formula for finding a percentage of a number is $ \text{Percentage (in decimal)} \times \text{Number} $. So, $0.20\times80 = 16$.

Step3: Check using proportion

Let the number be $x$. We set up the proportion $\frac{x}{80}=\frac{20}{100}$. Cross - multiplying gives us $100x=20\times80$. Then $100x = 1600$. Dividing both sides by 100, we get $x=\frac{1600}{100}=16$.

Answer:

16