We all make mistakes. Sometimes, if you play your cards right, they can become valuable learning opportunities. It's called "human error" for a …

# How to Calculate the Percent Error Formula

We take the mystery out of reporting the percent error correctly and show you how to use it in real life. Plus more math concepts.

## More Math Concepts

It's inevitable. At some point in every math class, someone asks the teacher (usually with an exasperated groan), "When are we going to use any of …

You might have been in fifth grade the last time you thought about how to multiply fractions. But if you're trying to cut a recipe in half or calculate …

You're sitting in math class trying to survive your latest pop quiz. The questions on Page 1 weren't too hard, but on the second page, you see a …

Subtracting fractions is simple — almost as simple as multiplying fractions — but the process of subtraction is different depending on whether the …

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