1510 years.
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You can calculate this as follows: (500 + 1000) / 2
Take whatever year it is, and add 500. For instance, 2010 + 500 = 2510.
500 years
500 - 350 = 150 years.
To find the middle number between 3000 and 500, you first need to calculate the average of the two numbers. Add 3000 and 500 together to get 3500, then divide by 2 to get 1750. Therefore, the middle number between 3000 and 500 is 1750.
200 -(-500) = 2500, but since there is no year 0 then it is 2499 years ago
500 years old
424
1501
1501
500 years from feb 24 2010