19 ÷ 4 = R

19 ÷ 4 = 4 R3.

To explain, when you divide 19 by 4, you find out how many times 4 can fit into 19. The number of whole times is 4, because 4 times 4 is 16, which is the largest multiple of 4 that’s less than 19. After subtracting 16 from 19, you have a remainder of 3. So, the answer is 4 with a remainder of 3.