Posted by ciera on Tuesday, January 23, 2007 at 9:55pm.
sabrina used a calcutator and started adding the whole numbers in order 1+2+3+4+5+..... what is the last number she would add that would get the sum on her calculator over 1000?
Try it yourself. You'll be surprised that it won't take very long to add up to 1,000.
To find the sum of the numbers from 1 to "n":
(1+n)(n/2)=sum
1001=(n^2+1)/2
2002=n^2+1
2001=n^2
n=44.7.....
So, 45 is the last number she would add.

math  jasmin, Thursday, October 11, 2012 at 8:35pm
995
Answer This Question
Related Questions
 math  You have 2 digits, 2 numbers, reverse digits and 54 if the difference and...
 College Algebra  The sum of two numbers is less than 12. The second number is 8...
 math  the product of 1000 whole number is 1000, what is the largest possible ...
 Math  The product of 1000 whole numbers is 1000. What is the largest possible ...
 math(adding mixed fractions)  please help me with (addition mixed fractions)i ...
 Math  10.Mr. Cartwright bought 2 7/8 pounds of grapes for his lunches. If he ...
 conjectures  Evaluate the following sums: 1 1+8 1+8+27 1+8+27+64 Add two more ...
 algebra  please write an explaination why (x^3)(x^4) is not x^12. I am confused...
 maths  the sum of N positive integers is 19. what is the maximum possible ...
 algebra  One number is 4 times another. If the sum of their reciprocals is 5/36...
More Related Questions