The formula is simple in that I want field A multiplied by field B to = field C

What happens is because field B is rounded due to the limit I put in the field because I just want two places after the decimal, it is calculating based upon the original math and not what the cell shows. For example.

51 x 68.33 = 3,484.83 but the cell shows 3,848.70 bc of the original amount being 68.3275

How do I get the field B to use the actual data in the cell instead of the original so that if someone not in the know can see that 51 * 68.33 = 3,484.83

Thank you in advance!