Final answer:
The number halfway between -63.4 and -63.41 is -63.405, obtained by calculating the average of the two numbers.
Step-by-step explanation:
The number that is halfway between -63.4 and -63.41 can be found by calculating the average of the two numbers. This is done by adding the two numbers together and then dividing by 2. Therefore, the calculation is:
(-63.4 + -63.41) / 2 = -126.81 / 2
= -63.405.
So, the number that is halfway between -63.4 and -63.41 is -63.405.