### Instruction: What is the sum of the prime numbers between 10 and 20?### Response: I know that a prime number is a positive integer that has exactly two factors: 1 and itself.
So, between 10 and 20, the only numbers that are prime are 11, 13, 17, and 19.
To find the sum of these numbers, I just need to add them up.
11 + 13 = 24, 24 + 17 = 41, and 41 + 19 = 60.
Therefore, the sum of the prime numbers between 10 and 20 is 60.