50
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There are 21 prime numbers between 100-200.
300
12. 13, if you count 200
Between 1 and 100.
The number halfway between 100 and 200 is calculated by finding the average of the two numbers. This is done by adding the two numbers together (100 + 200 = 300) and then dividing by 2. Therefore, the number halfway between 100 and 200 is 150.