# Calculate Decimal Probabaility Worksheets

How to Calculate the Probability of an Event - When we find the probability of an event, we are figuring out the chances of occurrence of an event. Probability is the likelihood of one or more event divided by the total number of outcomes. The easiest way to calculate the probability of multiple events is by simplifying the problem in different probabilities and multiplying the separate likelihood together. We can calculate probabilities in different ways: First, if you have to find out the probability of an event, you need to know the likelihood of an event. You need to know whether the event can take place or not. Moreover, the event and its opposite cannot take place at the same time. Next, figure out all the possible events and their possible likelihoods. For example, if we have to find out the possibility of rolling a 4 on a die. We know the rolling a die can give us 6 events. So, the total possible events are 6, and the outcome is only one that is rolling a 4. Then, we divide the probability of the event in consideration and divide it by the total number of outcomes. In the example mentioned above, we will divide 1 by 6. Finally, we will add up all the possible events. Note that the sum of the likely events needs to be equal to one.

• ### Basic Lesson

Introduces the use of the probability equation. What is probability of getting an ace if one card is picked up from a well shuffled pack of 52 cards? 1. One card out of 52 cards can be selected in 52 different ways. 2. Out of these 52 cases four cases will favor the event selecting an ace (Ace of Clubs, Ace of diamonds, Ace of Spades, and Ace of Hearts)

• ### Intermediate Lesson

This lesson uses beginner prealgebra skills. What are chances of picking a number less than or equal to six in single throw of dice?

• ### Independent Practice 1

Students practice with 20 probability problems. The answers can be found below. A jar contains 13 purple and 11 violet marbles. A marble is drawn at random. P (purple).

• ### Independent Practice 2

Another 20 probability problems. The answers can be found below.

• ### Homework Worksheet

Reviews all skills in the unit. A great take home sheet. Also provides a practice problem.

• ### Skill Quiz

10 problems that test probability skills.

• ### Homework and Quiz Answer Key

Answers for the homework and quiz.