Define the event you want to find the chance of
Count the number of favorable outcomes
Count the total number of possible outcomes
Divide favorable outcomes by total possible outcomes
Write the result as a fraction, decimal, or percentage
Use the formula: Probability = Favorable Outcomes / Total Outcomes
For percentage, multiply the probability by 100
For odds, compare favorable outcomes to unfavorable outcomes
For multiple events, apply addition or multiplication rules as needed
Check whether events are independent or dependent