# Probability Word Problems Worksheets

How to Calculate Probability - When we are finding out the probability, we are calculating the likelihood of a specific event taking place over given attempts. Mathematically, the probability is defined as the possibility of one or more events taking place divided by the total number of likely outcomes. Calculating probability is about breaking the problem in different possibilities and multiplying those possibilities by one another. In probability problems, we are given events that either happens or doesn't have the possibility of happening. The opposite of the event and the event cannot take place at the same time. We have to define all the possible outcomes. For example, if we consider rolling a three on a die as our event. Then we know that a 3 can be rolled only once on a 6-sided die. The total number of outcomes is 6. So, we have 6 possible events, and there is 1 outcome whose probability we want to calculate. We divide the likely events with the total number of the outcomes. In case we want to roll a 3 on a 6 sided- die, the number of events is 1, and the total number of outcomes is 6. Considering the formula of probability: P = number of possible events/ total number of outcomes, P = 1 / 6 , P = 0.166.

• ### Basic Lesson

Demonstrates how to outline Percent Word Problems. Example: What is probability of getting the number 4 when dice numbered from 1 to 6 is rolled?

• ### Intermediate Lesson

Uses slightly larger sentences and numbers than the basic lesson. Example: If you randomly choose a letter in the word "HIGHEST", find the probability that you choose an "H". Since the word contains 2 H, it means H has two possibilities to be selected out of seven.

• ### Independent Practice 1

Contains a series of 20 Percentage Word Problems. The answers can be found below. Example: In a school, 1/20 of students take drama classes, and 1/4 take drama class. What is the probability that a student takes computer class given that the student takes drama class?

• ### Independent Practice 2

Features 20 word problems. Example: A large basket of fruit contains 5 oranges, 8 apples, and 7 bananas. If a piece of fruit is chosen at random, what is the probability of getting an orange or a banana?

• ### Homework Worksheet

12 word problems for students to work on at home. An example problem is provided and explained. Example: A number cube has 6 sides. The sides have the numbers 2, 4, 7, 8, 1, and 5. If the cube is thrown once, what is the probability of rolling the number 9 or the number 5?

• ### Skill Quiz

10 Percent Word Problems. A math scoring matrix is included. Example: An event has a theoretical probability of 1/7. What is the probability of this event occurring in 210 trials?

• ### Homework and Quiz Answer Key

Answers for the homework and quiz.