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The rules for binary subtraction: Let us subtract the binary number
(111) from (1000) .
X Y X – Y 2 2
1 1
0 0 0 – 0 = 0 _____
0 (10) (10) (10) Borrow
0 – 1 = 1
0 1
(borrow 1, so that 10 – 1 = 1) 1 0 0 0
1 0 1 – 0 = 1 – 1 1 1
1 1 1 – 1 = 0 0 0 0 1
Reb t
A number system is a method of counting.
The Decimal Number System consists of ten digits from 0 to 9.
The Binary Number System consists of two digit, 0 and 1
The Octal Number System is used as a shorthand representation of long binary numbers.
The Hexadecimal Number System consists of 16 digits from 0 to 9 and A to F.
OneOne Touch Learn Section A (Objective)
A. Tick ( ) the correct option.
1. In the binary number system, the right-most digit before the fractional point is called
................................ .
a. MSD c. LSD
b. BSD d. None of these
2. Base 2 is another name for the ................................ .
a. Binary number system c. Hexadecimal Number System
b. Decimal Number System d. Octal number system
3. In Hexadecimal number system, the letters A to F mean ................................ .
a. 10 to 15 c. 9 to 6
b. 10 to 16 d. 8 to 15
4. The decimal number (345) is equivalent to ................................ .
10
a. (101011001) c. (110111001)
2 2
b. (111011101) d. (111110001)
2 2
26 Touchpad iPRIME (Ver. 2.2)–VII

