A white round pill imprinted with "381" on one side and a "b" on the other is identified as Diphenhydramine Hydrochloride 25 mg, which is an over-the-counter antihistamine commonly used to relieve symptoms of Allergies, hay fever, and the common cold. It is also used as a sleep aid due to its sedative properties. Always consult a healthcare professional before taking any medication.
4544
380. Last digit 5 or more middle number goes up, 4 or less you round down so stays where it is. 386 would round to 390.
400
0
381 3,127
700-381 = 319
0.0079
381
1, 3, 127, 381
584 + 381 = 965
381 = 3 × 127
254. 381 / 3 * 2