Chp 2.4 (Day 2) - Percent Equations

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 * 0.20 = 10.

Front

What is the formula to find the total amount when given a part and a percent?

Back

Total = Part / (Percent / 100). For example, if 30 is 60% of a total, Total = 30 / (60 / 100) = 50.

Front

How do you find what percent one number is of another?

Back

To find what percent one number (part) is of another (whole), use the formula: (Part / Whole) * 100. For example, to find what percent 25 is of 200, calculate (25 / 200) * 100 = 12.5%.

Front

What does it mean to mark down an item by a certain percent?

Back

Marking down an item by a certain percent means reducing its original price by that percentage. For example, a $50 item marked down by 20% would cost $50 - ($50 * 0.20) = $40.

Front

If a shirt costs $25 and is on sale for 15% off, how much do you pay?

Back

To find the sale price, calculate the discount: $25 * 0.15 = $3.75. Then subtract the discount from the original price: $25 - $3.75 = $21.25.

Front

What is the relationship between part, whole, and percent?

Back

The relationship is defined by the formula: Percent = (Part / Whole) * 100. This shows how the part compares to the whole in terms of percentage.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100. For example, 1/4 = (1 ÷ 4) * 100 = 25%.

Front

What is the percent increase formula?

Back

Percent Increase = [(New Value - Original Value) / Original Value] * 100. This formula calculates how much a value has increased in percentage terms.

Front

What is the percent decrease formula?

Back

Percent Decrease = [(Original Value - New Value) / Original Value] * 100. This formula calculates how much a value has decreased in percentage terms.