1+2 = 3
1+2+3 = 6
1+2+3+4 = 10
1+2+...+ N = 1/2(N+1)N
if N = 50, 1+2+...+50 = 1/2 x 51 x 50 = 1275
Since 2+4+6+...+100 = 2 x (1+2+3+...+50) = 2 x 1275 = 2550
It is 2550.
96
The median for 85, 93, 95, 96, 98, 99, 100, 100 is 97. The number in the middle is 96, and 98. Add - 96 + 98 = 194 Divide - 194 ÷ 2 = 97
It might be possible to work this in your head. Your 98 is 100 minus 2. This means 98 plus 98 is 100 plus 100 minus 2 minus 2. That's 200 minus 4 which gives 196 as the answer.
2 + 98 = 100
100 + 99 + 98 + 2 + 1 + 0.3 = 300.3
100
96
5,050
303
1 + 99 = 100 2 + 98 = 100 3 + 97 = 100 4 + 96 = 100, etc untll you got to 49 + 51 = 100 There would be 49 of these "=100" answers (That would be 4,900) Plus, you would have 50 left over with nothing to match up to. So your total would be 4,950.
The greatest common factor (GCF) of 98 and 96 is 2.
Since 98 is 100 minus 2, you can think of this as 136 + 100 - 2, or 236 - 2, the answer being 234.