What is the sum of all even numbers between 1 and 100?

5050
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1+2+...+99+100 = 1+100+2+99+...+50+51 = 101+101+101+...+101 = 101*50 = 5050 It's a calculation method invented by Gauss.
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Answers by country

5050
1000
5555
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answers
flagthe Netherlands
70%
5%
11%
11%
17
flagFrance
66%
16%
8%
8%
12
flagCanada
54%
22%
9%
13%
22
flagPoland
51%
10%
24%
12%
2770
flagIndia
45%
21%
15%
8%
70
flagGermany
44%
16%
14%
22%
50
flagthe United Kingdom
39%
18%
25%
15%
86
flagthe United States
36%
18%
30%
13%
66
flagAustralia
23%
19%
38%
19%
21