What is 102.5ml plus 6.55ml considering significant figures?

Answer 1

Previous response was:

109.05 mL Or 1.0905 x102, however, when taking sig figs into account,

if you look at equation, since 102.5 only goes to the tenth after the decimal,

the answer must be rounded up so that it too only goes to the nearest tenth after

the decimal. Therefore 109.05 rounded up to 109.1ml. Answer is 109.1 ml.

Answer 2

When adding or subtracting numbers, the result should be rounded to the least number of decimal places present in the original numbers. In this case, 102.5 ml has 3 significant figures and 6.55 ml has 3 significant figures, so the answer should be rounded to 1 decimal place as 109.1 ml.