1 + 2 + 3 + 4 + 5 + 6 + 7 all the way back to 99

1 + 2 + 3 + 4 + 5 + 6 + 7 all the way back to 99

1 + 99 = 100, 2 + 98 = 100, and so on. 49 + 51 = 100 has 49 100 and 50, and one = = 4950