Q: What is 20,515 squared (20,5152)

 A:
420865225
Scientific Notation: 4.20865225 x 108


Why does 20,5152 = 420865225?

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 20,515 x 20,515 = 420865225


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