You can either just add them up or use quick logic to add them in pairs:
All the numbers from 1 to 49 match up with 51 through 99 to = 49 pairs of 100 = 4900, than add the two you skipped 4900 + 50 + 100 = 5050 total
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The total of all of the numbers from 1 to 99 is 4950.
101
All numbers from 1 to 100 which are whole numbers are integers
5050
No, they're not. The range from 100 to 1,000 includes numbers like 100.6, 239.07,5431/2, and 942.638, and those are not 'whole numbers'.But the numbers in that range that have nothing after the decimal point, and haveno fraction after them, are all whole numbers.The same is also true of any number that's notbetween 100 and 1,000 .