The Birthday Problem

In this ratios activity, students complete 3 ratios for each word problem containing 2 digit numbers. Students complete 9 ratios total.

What is the probability that two people out of thirty have the same birthday? Sal tackles this problem with his characteristic skill and casual attitude. Students will find his process easy to follow - and the solution to the problem...

Apply what you learned in videos one and two on the substitution method with this application problem. Sal uses the substitution method to solve a system of equations.

Happy birthday to you — and to you! A festive video on probability examines the likelihood of two people in a group sharing a birthday, based on the size of the group. 

Use dependency to find a birthday. Learners use an interactive to keep track of excluded potential dates of a birthday using information provided to two people about a third's birthday. Scholars then use the dependency between the dates...

In this birthday problem worksheet, students solve 1 probability word problem.  Students determine the number of people needed to have a 50% probability that two people will have the same birthday.

Students make and analyze predictions and attempt to solve the birthday problem. They use the solutions they find to answer related questions.

Young scholars identify the probability of an event occurring. Learners explore the complement of an event in finding why an event will not happen. They also explore basics of probability within algebra.

Student calculate the probability of an event occurring. In this algebra lesson, students identify the probability of an event. They calculate what the chances are that someone in their class will have the same birthday.

In this probability worksheet, high schoolers solve 1 word problem about birthdays.  Students determine the number of people needed for a 50% chance of two people sharing the same birthday.