Page 18 - TP_Plus_v4_Class7
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Binary Subtraction
In binary subtraction, binary number of lower value is subtracted from the binary number of higher
value. The given table explains the subtraction of digit Y from digit X. If Y is greater than X, then 1 is
borrowed from the next position. When the binary digit 0 borrows 1 from the next most significant
digit, it becomes 10.
X Y X – Y
0 0 0 – 0 = 0
0 – 1 = 1
0 1
(borrow 1, so that 10 – 1 = 1)
1 0 1 – 0 = 1
1 1 1 – 1 = 0
For example, let us subtract the binary number (111) from (1000) .
2
2
1 1
0 (10) (10) (10) _____ Borrow
Factbot
1 0 0 0
Modern day binary number system was
– 1 1 1 invented by Gottfried Lebiniz in 1679.
0 0 0 1
Timeline
A number system is a systematic way of representing numbers to describe quantities.
The decimal number system consists of ten digits from 0 to 9.
The binary number system consists of two digits 0s and 1s.
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 letters from A to F.
Choose the correct option.
1. Which of the following is called the right-most digit before the fractional point in the binary number?
a. MSD b. LSD
c. BSD d. None of these
2. What is the another name for Base 2 number system?
a. Binary number system b. Hexadecimal number system
c. Decimal number system d. Octal number system
16 Plus (Ver. 4.0)-VII

