https://decimal-to-binary.com/multiplication-column.html?id=41

Multiply 10111 on 11.1000011001 = 112232.11112311110000000000 Column

Enter two numbers: the first multiplier and the second multiplier.

multiply by

x														1	0	1	1	1	.	0	0	0	0	0	0	0	0	0	0
x																	1	1	.	1	0	0	0	0	1	1	0	0	1
+															1	0	1	1	1	0	0	0	0	0	0	0	0	0	0
														0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
													0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
												1	0	1	1	1	0	0	0	0	0	0	0	0	0	0
											1	0	1	1	1	0	0	0	0	0	0	0	0	0	0
										0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
									0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
								0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
							0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
						1	0	1	1	1	0	0	0	0	0	0	0	0	0	0

					1	0	1	1	1	0	0	0	0	0	0	0	0	0	0
				1	0	1	1	1	0	0	0	0	0	0	0	0	0	0
				1	1	2	2	3	2.	1	1	1	1	2	3	1	1	1	1	0	0	0	0	0	0	0	0	0	0

answer:10111×11.1000011001 = 112232.11112311110000000000