Chemistry Help!! ?

Question

How do I get the answer 1273mL from the problem 0.1273mL- 0.000008mL

Answer 1

0.1273 - 0.000008 = 0.1237 mL

In using significant figures, the answer is rounded off to the decimal where the uncertainty first appears (the largest decimal place). The uncertainty in 0.1273 begins in the 4th decimal place; in 0.000008, it begins in the 6th decimal place. So, the answer must be rounded to the 4th decimal since that is the larger uncertainty.