6396÷15=426.4
15 will go into 63 4 times with 3 left
bring down the 9 now you have 39 and 15 will go into it 2 times with 9 left
bring down the 6 you have 96 and 15 will go into that 6 times with 6 left
put you decimal after the 6 and bring down a 0
60 ÷ 15 =4
0 remainder