sum fun (math)
posted by Jenny .
find a quick and easy method to compute the sum of the first 100 counting numbers (no calculators allowed)
Respond to this Question
Similar Questions

algebra
The sum of the first n counting numbers 1 + 2 + 3 + 4 + 5 ... + n is given by S = n/2(1 + n). a) Find the sum of the numbers 14 to 40 inclusive Answer is 729. But i don't get why. Someone explain what the qestion means by "inclusive" … 
algebra
The sum of the swuares of the first n counting numbers: 1² + 2² + 3² + 4² + 5² + 6² + ... +n² is given by the formula S = n(n+1)(2n+1)  6 Find the sum of the squares of all the counting numbers between 15 and 35. … 
SUMS?
what is the sum of the first towo odd numbers? 
math
"Find a quick and easy method to compute the sum of the first 100 counting numbers." 
Math 8th grade
I NEED THESE IN ALGEBRAIC EXPRESSION!! The larger of two sums is 12 more than the smaller. Their sum is 84.Find the numbers. The sum of two numbers is 45. The first is 9 less than the second.Find the numbers. The second of two numbers … 
math
The sum of the first 5 natural numbers is 15 or (5)(6)/2. The sum of the first 21 natural numbers is 231=(21)(22)/2, and the sum of the first 30 numbers is 465. Use inductive reasoning to derive the formula for the sum of the first … 
math URGENT!!!!
i have a list of 5 different numbers. the sum of 2 of the numbers is 0. the sum of 2 of the numbers is 1. the sum of 2 of the numbers is 2. the sum of 2 of the numbers is 3. the sum of 2 of the numbers is 4.the sum of 2 of the numbers … 
Math
1.(A)(i)Show that 2+4+6+8+..+2n=n(n+1). (ii)Find the sum of the first 200 even numbers. (iii)Find the sum of the first 200 odd numbers. (B)(i)Use the formula at the beginning of the question to find the sum of the first 2n natural … 
Counting and Probability
What is the difference between the sum of the first 400 even counting numbers and the sum of the first 400 odd counting numbers? 
Math
1. If the product of 5 and the sum of 10 and a certain number is equal to 15, what is the number?