445
76
244
38
The sum of 38 and -5 is 33.
The sum is 64
67
The sum of -38 and -56 is -94.
19 plus 19 is 38
-19 + 6 - 25 = -38
The sum of the even numbers is (26 + 28 + ... + 100); The sum of the odd numbers is (25 + 27 + ... + 99) Their difference is: (26 + 28 + ... + 100) - (25 + 27 + ... + 99) = (26 - 25) + (28 - 27) + ... + (100 - 99) = 1 + 1 + ... + 1 There are (100 - 26) ÷ 2 + 1 = 38 terms above which are all 1; their sum is 38 x 1 = 38. So the difference of the sum of all even numbers and all odd numbers 25-100 is 38.
The answer is 630. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
276