What number is halfway between 1.6 and 1.7?

1.65

It is 0.05 more than 1.6 and 0.05 less than 1.7

To find a halfway point (which is also the average), add the numbers together and divide by 2.

1.6 + 1.7 = 3.3 and 3.30 / 2 = 1.65