This Pi Day bracelet and necklace activity provides a concrete representation of Pi. For younger students who may struggle with the concept of Pi being an infinite number, the Pi bracelet and necklace gives them a way to remember and communicate what Pi is.

## How to Make a Pi Bracelet and Necklace

Pi (3.14159265359…) is the ratio of the circumference of a circle to the diameter. If you divide the circumference of any circle by the diameter, you will always get exactly the same number, Pi. This makes Pi a constant. Regardless of the circumference and diameter of the circle, the result of the circumference divided by the diameter will always be Pi.

Pi is also irrational, meaning the number goes on forever, or infinite. You can see the first million digits at **PiDay.org**, but you can never see the last number.

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#### Supplies for the Pi Day Bracelet and Necklace

- Beads
- Yarn or string
- Scissors
- Pony beads. You’ll need 11 colors for 0 to 9 and a color for the decimal point.

Directions:

Let’s make a Pi Day bracelet or necklace that uses the first 70 numbers of Pi. (If you put “first 70 digits in Pi” into Google, it will display 70 digits of Pi. You can put in any number.)

3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 …

Measure enough string or yarn to make a bracelet or necklace. Add 3 extra inches. Then, double this length of string. (Any excess can be trimmed later.)

Tie a heavy knot at one end. Assign the numbers below a bead color and write them on the worksheet. Then, assign a color to the decimal point.

String a “number 3 bead” and the “decimal point” bead.

Continue stringing the beads according to the numbers listed after “3.”. Tie it off when you are finished.

**Other Pi Day Resources**

**Demonstrate Pi Day with this hands-on activity (that is super simple!)**