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 the number just before 900?

The number just before 900 is 899.


What is one less than 900?

One less than 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 the average of 4.2 2.61 and 3.6? Use of linear function in real life? Can 127 be divided evenly? Which facts are true for the graph of the function below F x 3 4 x Adomain of f x is x 0 Bincreasing Cy-intercept is 0 1 Drange of F x is y 0 Edecreasing Fx-intercept is 1 0? Does education and literacy mean same thing? What is 9141 subtract 6372? Predict the products of the following reaction MgCl2 plus K equals? What is 334000000 in scientific notation? What is 13 fifths minus 3 halves? What do the dots above the repeated line notes in measure 2 mean? What is the square root of 242 rounded to the nearest integer? Forty eight pens are packaged in 4 boxes. How many pens are packaged in 9 boxes? How do you simplify 15 over 28? How do you write 7 hundred in place value? Is 800 dollars take home a week good? What would you do if you caught a student cheating? What is the definition of frequency table in math terms? How would you write 6 billion in standard notation? How many o are in a billion? What digit is in the tenths column of 91.6?

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.