+0

# what is all the numbers from 1 to 100 added up?

0
3887
4

what is all the numbers from 1 to 100 added up?

math arithmetic
Aug 22, 2014

#2
+111470
+10

There is a "formula" for this. But notice when we add the first number, 1, and the last number, 100, we get 101. And addnig the next-to-the-last number, 99, and the second number, 2, we also get 101. And, continuing in this manner, we have 50 pairs of numbers that each add to 101. Therefore, 50 * 101 = 5050.

Aug 22, 2014

#1
+111246
+10

You can think of it like this

0,    1,   2,  ......................49

100,99,98,........................51

100+100+100..................100 ,    The only missing number is 50

So answer must be 100*50+50=5050

Aug 22, 2014
#2
+111470
+10

There is a "formula" for this. But notice when we add the first number, 1, and the last number, 100, we get 101. And addnig the next-to-the-last number, 99, and the second number, 2, we also get 101. And, continuing in this manner, we have 50 pairs of numbers that each add to 101. Therefore, 50 * 101 = 5050.

CPhill Aug 22, 2014
#3
+111470
0

Ah...Melody beat me to it.....rats!!!!!!

Aug 22, 2014
#4
+111246
0

Never mind Chris I gave you points anyway lol

I am quite enjoying the two of us answering questions with different approaches.

It opens up horizons.

Aug 22, 2014