Number System for UGC NET: How I Learned Binary to Hexa in 20 Minutes (Day 1 Note)
Yesterday I watched one video and finally understood. Sharing my simple note - no theory, only what is asked in exam.
What is Number System?
We use 4 types in computer:
1. Decimal- We use daily - Base 10 - Digits 0-9
2. Binary- Computer uses - Base 2 - Only 0,1
3. Octal - Base 8 - Digits 0-7
4. Hexadecimal- Base 16 - Digits 0-9, A=10, B=11, C=12, D=13, E=14, F=15
Only 3 Conversions asked in UGC NET:
1. Decimal to Binary: Divide by 2, write remainder reverse.
Example: 13 = 1101
2. Binary to Decimal: Multiply by power of 2.
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Example: 1101 = 1*8 + 1*4 + 0*2 + 1*1 = 13
3. Shortcut Trick for Exam (FASTEST):
Binary to Octal = Make group of 3 from right
Binary to Hexa = Make group of 4 from right
Example: Binary 110101
For Octal: 110 101 = 6 5 = 65 Octal
For Hexa: 11 0101 = 3 5 = 35 Hexa
Thats it. No need to learn all tables.
My 20 min video source: Search YouTube "Gate Smashers Number System" - first video.
Tomorrow I am learning Logic Gates AND OR NOT. I will share Day 2 notes.
If you are also preparing from zero, follow me. We will crack together.
- - Rajnee, Siliguri
