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If 30 times 30 equals 900 why does 29 times 31 equal 899?

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Anonymous

∙ 15y ago
Updated: 9/17/2023

(x-1)*(x+1) = x2 - x + x - 1 = x2 - 1

So, when x = 30,

29*31 = 30*30 - 1

Or, since 30*30 = 900, 29*31 = 900-1 = 899

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Wiki User

∙ 15y ago
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To get the next number after any number, just add 1.


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