# Amazing Birthday Cards Activity

Amazing Birthday Cards is an activity in which students respond “yes” or “no” to five numbered cards. The teacher uses mathematical patterns to determine the birthdays of these students based on their responses. Students discover the mathematical pattern that enables the teacher to identify the birthdays and if you choose to you can show them that this activity is based upon the base 2 number system. Amazing Birthday Cards never ceases to amaze the students!

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### Amazing Birthday Cards Activity Preview Pages (6 of 14)

(View Actual Pages from the Amazing Birthday Cards Activity)

### Part of The Complete Collection of Lessons, Projects, and Games

(42 Math Lessons, Projects, and Games – 438 pages)

### Included in Number Sense Activities eBook

(9 Number Sense Lessons and Projects)

Lesson Description: Amazing Birthday Cards is an activity in which students respond “yes” or “no” to five numbered cards and the teacher uses mathematical patterns to determine the birthdays of these students based on their responses. Students discover the mathematical pattern that enables the teacher to identify the birthdays and they come to understand that this activity is based upon the base 2 number system. Comparing our base 10 number system to the base 2 number system also deepens student understanding of our system. Amazing Birthday Cards is an activity that never ceases to amaze the students!

Math Content: Number Patterns, Logic, Base 2 Number System, Other Number Systems

Time Required: 1 Class Period (or small parts of several class periods)

Amazing Birthday Cards includes:

• 1 Amazing Birthday Cards Teacher Notes page
• 5 Amazing Birthday Cards Numbered Activity Cards
• 1 Amazing Birthday Cards Number Pattern worksheet
• 2 Amazing Birthday Cards Mathematics worksheets
• 2 Amazing Birthday Cards Mathematics worksheet Answer Keys
• 2 Amazing Birthday Cards Teacher Tips pages
• 1 Amazing Birthday Cards Cover Sheet                           14 pages in all!

Materials Needed: None

Teacher Testimonial: Amazing Birthday Cards is an activity I use every year. The students enjoy participating in this activity and are amazed that by simply saying “yes” or “no” in response to the five cards that I hold up, I can tell them their birthdays. I only take a few of the many volunteers I have each day, thereby building up the suspense before I reveal the mathematical basis for my success in the activity. (Some students think that I actually take my class rosters home and memorize 200+ birthdays each year! As if I had time for that!) The Birthday Cards Number Pattern worksheet allows the students to generate the number pattern themselves and try it out on their friends and family.