Rates, Percents & Constant of Proportionality Mini Flashcard

Front

What is the formula to calculate percentage?

Back

Percentage = (Part / Whole) × 100

Front

If 23 out of 25 students chose pizza, how do you find the percentage of students who chose pizza?

Back

Percentage = (23 / 25) × 100 = 92%.

Front

What is the average rate of speed?

Back

Average rate of speed = Total distance / Total time.

Front

If Gregg drives 135 miles in 3 hours, what is his average speed?

Back

Average speed = 135 miles / 3 hours = 45 miles per hour.

Front

What does the constant of proportionality represent?

Back

It represents the ratio between two proportional quantities.

Front

In the equation y = kx, what does k represent?

Back

k is the constant of proportionality.

Front

How do you calculate the percentage decrease in price?

Back

Percentage decrease = ((Old Price - New Price) / Old Price) × 100.

Front

If a pair of jeans was reduced from $30 to $18, what is the percentage reduction?

Back

Percentage reduction = (($30 - $18) / $30) × 100 = 40%.

Front

What is a proportional relationship?

Back

A relationship where two quantities maintain a constant ratio.

Front

If y = 117x, what is the constant of proportionality?

Back

The constant of proportionality is 117.