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Subjects>Math>Math & Arithmetic

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

Updated: 9/17/2023

Wiki User

∙ 15y ago

Best Answer

(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

Wiki User

∙ 15y ago

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Continue Learning about Math & Arithmetic

What is the number before 900?

899

What does 900 times 80 equals what?

72,000

What times 37 equals 900?

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

What times that same number equals 900?

30 x 30 = 900

What is 15 times 60 equals?

15 times 60=900

Related questions

What 2 numbers equal 900?

One example is 1 + 899.

What is the number before 900?

899

What comes after 899?

900

What is one more than 899?

It is: 899+1 = 900

What is 1-900?

1-900 = -899

What is 899 rounded to the nearest ten?

900

What number comes after 899?

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

How many many centimeters equal 9 meters?

There are 900 centimeters in 9 meters, as 1 meter is equal to 100 centimeters.

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

What number times itself equals 900?

It is: 30*30 = 900

What is 900 times a 76 times 6?

900 times 76 times 6 is equal to 410,400.

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