Proportional Reasoning- Percent

Front

What is proportional reasoning?

Back

Proportional reasoning is the ability to compare ratios and understand the relationship between quantities in terms of their relative sizes.

Front

What does percent mean?

Back

Percent means 'per hundred' and is a way to express a number as a fraction of 100.

Front

How do you calculate the percentage of a number?

Back

To calculate the percentage of a number, multiply the number by the percentage (in decimal form). For example, 45% of 220 is 220 * 0.45 = 99.

Front

If 45% of Ayana's coins are pennies, how do you find the number of coins that are not pennies?

Back

To find the number of coins that are not pennies, subtract the number of pennies from the total number of coins. Total coins - (Total coins * Percentage of pennies) = Not pennies.

Front

What is simple interest?

Back

Simple interest is calculated on the principal amount, or the original amount of money invested or borrowed.

Front

How do you calculate simple interest?

Back

Simple interest can be calculated using the formula: Interest = Principal x Rate x Time.

Front

What is the formula to find the final price after tax?

Back

Final Price = Original Price + (Original Price x Sales Tax Rate).

Front

If a jacket costs $85 and is 40% off, how do you find the sale price?

Back

Sale Price = Original Price - (Original Price x Discount Percentage). For example, Sale Price = 85 - (85 x 0.40) = $51.

Front

What happens to the price of an item after a discount and then a markup?

Back

The final price after a discount and then a markup may not return to the original price. Calculate each step separately.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 2.5% = 2.5 / 100 = 0.025.