Q: What is sum of 1 plus 2 plus 3 plus . plus 98 plus 99 plus 100?

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100

99 + 98 + 97 = 294

505

It is instructive to note that you can rewrite 1+2+3+4....+99+100 as 1+100+2+99+3+98....+50+51 Then you can group each pair of numbers as (1+100)+(2+99)+(3+98)+...+(50+51) All of these couplets add up to 101, and there are 50 of them. Thus the sum of the first 100 whole numbers is 50x101. This can be calculated at 5,050.

Add them up. 90, 91, 92, 93, 94, 95, 96, 98, 99, 100

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100

100 + 99 + 98 + 2 + 1 + 0.3 = 300.3

5,050

Sum of numbers from 1 to 100:(1+100) + (2+99) + (3+98) + (4+97) + ... + (49+52) + (50+51) =50 pairs, each pair adds up to 101= (50 x 101)= 5,050

99 + 98 + 97 = 294

297

505

The median is (98+99)/2 = 98.5

The three consecutive numbers whose sum is 294 are 96, 98 and 100. Also, 97, 98 and 99.

It is instructive to note that you can rewrite 1+2+3+4....+99+100 as 1+100+2+99+3+98....+50+51 Then you can group each pair of numbers as (1+100)+(2+99)+(3+98)+...+(50+51) All of these couplets add up to 101, and there are 50 of them. Thus the sum of the first 100 whole numbers is 50x101. This can be calculated at 5,050.

1 + 98 = 99

100 + 71 = 171, as does 99 + 72, 98 + 73, and so on.