### 2 quick tips for faster mental math

You probably do mental math every day—learn to do it faster with these simple tips!

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### Dear Duolingo: Why are the words for 11 and 12 weird in so many languages?

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### Why do Mexican students learn hieroglyphics in math class?

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### Counting in other languages: not as easy as 1, 2, 3!

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### A guide to 3rd grade math topics

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### A guide to 4th grade math topics

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### A guide to 2nd grade math topics

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### A guide to 7th grade math topics

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### A guide to 5th grade math topics

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### A guide to 8th grade math topics