I really think you can do this.
13, 14, 15, 16, 17, 18, 19, 20...
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Just count by three ... 3, 6, 9, 12 ,15, 18, 21, 24, 27 ... all the way to 99. There are 33 numbers in this list. 100 is not an even multiple of 3.
Exactly the same way you do when they're all whole numbers, or there are more than three numbers, or they're a mixture of whole numbers and decimals: -- Add up all the numbers on the list. -- Divide the big sum by the number of items on the list.
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1+3+5+7+9+11 all the way to 100 = ?
List the numbers from 2 to 100. Rows of 10 work well. Cross out all the multiples of 2 that are greater than 2. This will be the rest of the even numbers. Go to the next number that isn't crossed out (3) and cross out all of its greater multiples. Proceed in this fashion. Next up will be 5. You can stop when you get to fifty. The numbers that aren't crossed out are prime.