When rounding 750 to the nearest hundred, you look at the digit in the tens place, which is 5. Since 5 is greater than or equal to 5, you round up the hundreds digit to 8. Therefore, 750 should be rounded to 800.
700
745.00
It is the same distance from 700 to 800.
700 + 800 = 1500/2 = 750
750
800
800
750
800
800
800
The halfway point between 700 and 800 is (700 + 800) ÷ 2 = 750