on the first math exam, 16 students received an A grade. On the second math exam, 12 students received an A grade. What percentage decrease is that?

actual decrease: 4

percent decrease: 4/16 = 25%

To find the percentage decrease between two values, you can use the following formula:

Percentage decrease = (Initial value - Final value) / Initial value * 100

In this case, the initial value would be the number of students who received an A grade on the first math exam (16), and the final value would be the number of students who received an A grade on the second math exam (12).

Percentage decrease = (16 - 12) / 16 * 100

Simplifying the equation:

Percentage decrease = 4 / 16 * 100

Percentage decrease = 0.25 * 100

Percentage decrease = 25%

Therefore, the percentage decrease between the first math exam and the second math exam is 25%.

To calculate the percentage decrease, you need to find the difference between the initial quantity (16) and the final quantity (12), then divide that difference by the initial quantity and multiply by 100 to express it as a percentage.

First, find the difference:
Initial quantity - Final quantity = 16 - 12 = 4

Next, calculate the percentage decrease:
(4 / 16) * 100 = 25%

Therefore, the percentage decrease in the number of students receiving an A grade on the second math exam compared to the first math exam is 25%.