Amaze your students as you guess the days of the week on which they were born by using a simple formula! Websites to check answers are included. Students will then use the formula to calculate the days on the week on which they were born. They will then figure out the fraction, decimal, and percent for each BIRTH day of the week for their class, and compare it to the actual worldwide LEAST and MOST common birth days. Adapt to lower grades by using fractions only.