Question

a team of students lined up dominoes on the gym floor. 550 dominoes fell over and 75 are still standing. what percentage of the dominoes fell over? write your answer using a percent sign (%).

Explanation:

Step1: Find the total number of dominoes

The total number of dominoes is the sum of the fallen dominoes and the standing dominoes. So, \(550 + 75=625\).

Step2: Calculate the percentage of fallen dominoes

The formula for percentage is \(\text{Percentage}=\frac{\text{Part}}{\text{Whole}}\times100\). Here, the part is the number of fallen dominoes (\(550\)) and the whole is the total number of dominoes (\(625\)). So, \(\text{Percentage}=\frac{550}{625}\times 100\).
First, simplify \(\frac{550}{625}=\frac{22}{25}\) (dividing numerator and denominator by \(25\)). Then, \(\frac{22}{25}\times100 = 22\times4 = 88\).

Answer:

\(88\%\)