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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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Continue Learning about Math & Arithmetic

What is the number before 900?

899


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One less than 900 is 899.


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The number just before 900 is 899.


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37 does not divide evenly into 900 The answer is 900/37 = 24.324

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One example is 1 + 899.


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899


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It is: 899+1 = 900


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1-900 = -899


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900


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100 centimeters equals a meter. Multiply 9 times 100. 900 centimeters equals 9 meters.


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To get the next number after any number, just add 1.


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One less than 900 is 899.


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The number just before 900 is 899.


What is the number when you round 899 to the nearest thousand?

The number is still 899, but it has been rounded to 1,000 .


What times by itself and equals 900?

30 x 30 = 900

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