Video from the Global Math Project.

And here are some additional answers.

### Try It at Home

Ask your kids the question: “What Is Math?”

I’d love to hear what they say!

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Videos

## Math Is…

### Try It at Home

## For the Curmudgeons: Vi Hart’s Anti-Pi Rant

#### More about Tau:

## Pi: Who Needs That Many Digits?

#### How you round it off makes a difference:

## Pi and Buffon’s Matches

#### For a kid-friendly version of this experiment, try throwing food:

## Pi Day: It’s an Irrational Holiday

## Pi Makes a River Bend

### Update

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Denise Gaskins' Let's Play Math

Helping families to learn and enjoy math together.

Video from the Global Math Project.

And here are some additional answers.

Ask your kids the question: “What Is Math?”

I’d love to hear what they say!

Want to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.

From Numberphile: Pi is famously calculated to trillions of digits – but Dr. James Grime says 39 is enough.

An extra note from Dr. Grime: “Since pi39 ends in 0, you may think we could use pi38 instead, which has even fewer digits. Unfortunately, the rounding errors of pi38 are ten times larger than the rounding errors of pi39 — more than a hydrogen atom. So that extra decimal place makes a difference, even if it’s 0.”

Want to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.

From Numberphile: Dr Tony Padilla’s unique (and low budget) twist on the Buffon’s Needle experiment to learn the true value of Pi.

Do you have a favorite family activity for celebrating Pi Day? I’d love to hear it!

Want to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.

I just discovered this fun Pi Day song from The Singing Nerd. Definitely need to add him to my YouTube subscriptions.

Hat tip: Singing Banana.

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From Numberphile: “Sinuosity is a measure of how ‘bendy’ a river is. It is the length of the river divided by the direct route. Featuring Dr. James Grime.”

After posting this video, Dr. Grimes and Lawrence Roberts began collecting and analyzing data about real-world rivers. It turns out the pi theory of sinuosity is too simple. Read about their results: