(8 + 70)/2 = 39
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The square root of 70 is between 8 and 9, and is irrational. This is because 70 is between the squares of 8 and 9 (64 and 81, respectively), and because the square root of 70 continues without end and without a reliable pattern. Note that this is only one out of infinite number of irrational numbers between 8 and 9.
67 is the greatest prime number between 55 and 70
Halfway between 70 and 100 is (70 + 100) ÷ 2 = 85.
Every number that is over 70, and has a 2, 4, 6, 8 and a 0 is your answer
The prime numbers between 70 and 80 are 71, 73, and 79.