The physician has ordered Coumadin $\mathrm{gr} \frac{3}{10}$. Coumadin is supplied in $6 \mathrm{mg}$ tablets. How many tablets will the patient receive?

Step 1 ：The physician has ordered Coumadin \(\mathrm{gr} \frac{3}{10}\). Coumadin is supplied in \(6 \mathrm{mg}\) tablets. How many tablets will the patient receive?

Step 2 ：First, we need to convert the ordered amount from grains to milligrams, as the medication is supplied in milligrams. We know that 1 grain is approximately equal to 64.8 milligrams.

Step 3 ：So, we multiply the ordered amount in grains by 64.8 to get the equivalent amount in milligrams: \(0.3 \times 64.8 = 19.44 \mathrm{mg}\).

Step 4 ：Then, we divide this amount by the amount of medication in each tablet to find out how many tablets the patient will receive: \(\frac{19.44}{6} = 3.24\).

Step 5 ：The number of tablets calculated is not a whole number, which is not practical as we cannot give a fraction of a tablet. Therefore, we need to round up to the nearest whole number to ensure the patient receives enough medication.

Step 6 ：Rounding up \(3.24\) to the nearest whole number, we get \(4\).

Step 7 ：Final Answer: The patient will receive \(\boxed{4}\) tablets.