Ten of them.
Forty palindromes.
It is the same distance from 700 to 800.
The halfway point between 700 and 800 is (700 + 800) ÷ 2 = 750
800 of them.
It is closer to 700.
The prime numbers between 700 and 800 are: 701 709 719 727 733 739 743 751 757 761 769.
800 * 700 = 560,000
Do the subtractions - 735 - 700, versus 800 - 735, and see which is less.
100 + 700 = 800
700
850.
800