Question

What is sum of numbers 1 2 3 4 5 6 ... 99 100=

Answer 1

It's 5050

Explanation:

So to able to find the answer to that, you add 1 and 100 together which is 101,

Next you multiply 101 by the middle number which is 50:

101x50= 5050

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Another example:

1+2+3+4+5+6+7...2536+2538

Ok so we first do 1+2538 which is 2538, and then the middle number is 1269, next we do 2538x1269=3220722 so 1+2+3+4+5+6+7...2536+2538= 3220722

HOPE THIS HELPS :D

Answer 2

if you add it one by one, 5050 maybe.