PerFracProb #2

Front

What is the formula to find the original cost of an item given the sales tax amount and the sales tax rate?

Back

Original Cost = Tax Amount / (Sales Tax Rate) = Tax Amount / (Tax Rate as a Decimal)

Front

If a student spells 12 out of 15 words correctly, how do you calculate the percentage of correct answers?

Back

Percentage = (Number of Correct Answers / Total Number of Questions) * 100

Front

What is the formula to calculate the amount of a raise given a percentage increase and the current salary?

Back

Raise Amount = Current Salary * (Raise Percentage as a Decimal) = Current Salary * (Raise Percentage / 100)

Front

How do you add fractions with different denominators?

Back

Find a common denominator, convert the fractions, then add the numerators.

Front

What is the probability of an event?

Back

Probability = (Number of Favorable Outcomes) / (Total Number of Possible Outcomes)

Front

How do you convert a percentage to a decimal?

Back

Divide the percentage by 100.

Front

What is the process to find the sum of fractions?

Back

1. Find a common denominator. 2. Convert each fraction. 3. Add the numerators.

Front

What is the formula for calculating the total cost including tax?

Back

Total Cost = Original Cost + (Original Cost * Sales Tax Rate) = Original Cost * (1 + Sales Tax Rate)

Front

How do you find the probability of rolling a specific sum with multiple dice?

Back

Count the number of ways to achieve that sum and divide by the total possible outcomes (6^number of dice).

Front

What is the method to calculate the percentage score on a test?

Back

Percentage Score = (Correct Answers / Total Questions) * 100