Q: What is 20,689 squared (20,6892)

 A:
428034721
Scientific Notation: 4.28034721 x 108


Why does 20,6892 = 428034721?

When you're trying to find what a number is when squared, you take the number and multiple it by itself.

So, that means you take 20,689 x 20,689 = 428034721


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427951969427993344428076100428117481

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