Example: making a very old intel-based computer work out what 6×9+11 is.

Step-by-step instructions	official mnemonics	in hexadecimal	now in binary
Think of the number 6, call it A.	MOV AL, 6	B0 06	1011000000000110
Think of the number 9, call it B.	MOV BL, 9	B3 09	1011001100001001
Multiply A by B.	MUL AL, BL	F6 E3	1111011011100011
Think of the number 11 instead of 9, call it B.	MOV BL, 11	B3 0B	1011001100001011
Add B to A.	ADD AL, BL	02 C3	0000001011000011
Display the answer, A.	OUT 2, AL	E6 02	1110011000000010

All that to make the number 65 appear on some little lights in binary. 01000001.