Science is a field that comes with it's fair share of number crunching. However, I'd venture to say that it's only about 10-15% of your work day to day (in Bio and Chem). When making solutions/buffers it helps to know your basic scientific math. Knowing how concentrations will different throughout an experiment is useful.
Setting up an experiment comes with preparation and a bit of crunching but running it usually means you've figured out your numbers and are just going through the motions of adding what is needed to test your hypothesis.
Hope this helps!