answersLogoWhite

0

Subjects>Math>Math & Arithmetic

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

User Avatar

Anonymous

∙ 16y 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

User Avatar

Wiki User

∙ 16y ago
Copy

What else can I help you with?

Continue Learning about Math & Arithmetic

What is the number after 899?

The number after 899 is 900.


What is the number before 900?

899


What is one less than 900?

One less than 900 is 899.


What is the number just before 900?

The number just before 900 is 899.


What does 900 times 80 equals what?

72,000

Related Questions

What 2 numbers equal 900?

One example is 1 + 899.


What is the number after 899?

The number after 899 is 900.


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


How many many centimeters equal 9 meters?

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


What number comes after 899?

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


What is one less than 900?

One less than 900 is 899.


What is the number just before 900?

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 .

Trending Questions
What is seven ninths of 18? Round 155555 to the nearest hundred thousand? What is 1.38 rounded to the nearest tenth? The radius of a circle is 9cm what is the area? How do you write 17 tenths as a decimal? Who was the first dancer to insure her legs for 1 million dollars? What is the value of the 3 in 488.893? What is the positive square root of 22? What is evenly divisible by 260? Is an IQ of 127 good for a 5 year old? What does mdccccvii mean in roman numerals? What is the scale of measurement on a stevensons screen? What is the weight of a 1rupee coin? What is the name of the line around the centre of the earth? What is the product of 60000 written in scientific notation? What is 25m 75cm? How do you divide 333 divided by 9 step by step? What is the place value of 6 in 3401.62? What is Roman numeral for 1 250? How do you write 1.7 as percent?

Resources

Leaderboard All Tags Unanswered

Top Categories

Algebra Chemistry Biology World History English Language Arts Psychology Computer Science Economics

Product

Community Guidelines Honor Code Flashcard Maker Study Guides Math Solver FAQ

Company

About Us Contact Us Terms of Service Privacy Policy Disclaimer Cookie Policy IP Issues
Answers Logo
Copyright ©2026 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.