Sum of the first 9 Natural Numbers

Sum of the First <-- Enter n

Calculate the sum of the first 9 Natural Numbers

Σ n Natural Numbers formula:
S9 =n(n + 1)
2

S9 =9(9 + 1)
2

S9 =9(10)
2

S9 =90
2

S9 = 45

Display the first 9 Natural Numbers where Nn denotes the nth number
n Nn
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9