KwickClips Computer Systems · 43 sec · free
What are the two steps after writing the positive number?
Short answer. Flip every bit, then add 1.
What range does 8-bit two's complement cover?
-128 to 127.
Two's complement
| Step | Bits |
|---|---|
| Write +5 | 0000 0101 |
| Flip bits | 1111 1010 |
| Add 1 | 1111 1011 |
Remember
| Flip, then add 1 |
| Range: -128 to 127 |
Bits have no minus sign. So how is minus five stored? Use two's complement. Write plus five. Flip every bit. Add one to get minus five. Remember. Flip, then add one. Eight bits cover minus one twenty eight to one twenty seven.
This clip is from the full lesson: Binary Arithmetic: Addition, Overflow, Two's Complement and Shifts — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ISC Class 11 Computer Science (868), Cambridge IGCSE Grade 9 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Edexcel GCSE GCSE Computer Science (1CP2)
More KwickClips from this lesson
Where do you start adding binary numbers?40 sec
What is the largest number 8 bits can hold?40 sec
What does a left shift by 1 do?40 secVoice-over is AI-generated; the script is written and checked by Kajal Ma'am. Confirm anything you plan around against your official board document. We never ask for a password or an OTP.