### Today we’re going to learn how math makes it easy to estimate things that seem practically impossible to calculate. In particular, since summer is in full swing, we’re going to take math to the beach and think about the age-old question: How many grains of sand are on all of Earth’s beaches? As long time Math Dude fans may recall, we first learned about using math to make estimates when we watched Secret Agent Math daringly calculate how many breaths of air there are in a sealed room. So why are we revisiting this topic? Because learning to combine your brain with math to make estimates is an absolutely invaluable skill—and it’s a skill that’s only developed with practice. Which is exactly what we’re going to do today.

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## Step 4: Calculate the Number of Sand Grains

Earth’s beaches contain roughly 5,000 billion billion—aka, 5 sextillion—grains of sand.

## Wrap Up

### Until next time, this is Jason Marshall with The Math Dude’s Quick and Dirty Tips to Make Math Easier. Thanks for reading, math fans!

Beach image from Shutterstock