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 secDisclaimer. KwickAcademy is free study material for general learning and revision. Parts of it, including the voice-over, are produced with the help of AI tools and may contain errors; if you spot one, please tell us and we will correct it. Syllabus, marks and exam details follow the latest official board publications available to us, and boards can change them at any time, so always confirm against your board's official website and your school. Using this material does not guarantee any marks or result. Board names and trademarks belong to their owners; Kwickprep is not affiliated with or endorsed by any examination board. We never ask for passwords, OTPs or ID numbers. Your progress is saved only in this browser. Full disclaimer · Privacy