Page 14 - TP_V5.1_C7_fb
P. 14
The rules for adding two binary digits are given below:
X Y X + Y
0 0 0 + 0 = 0
0 1 0 + 1 = 1
1 0 1 + 0 = 1
1 1 1 + 1 = 10 (carry 1)
For example, let us add the binary numbers (101111) and (10111) .
2 2
____
1 1 1 1 1 Carry bits
1 0 1 1 1 1
+ 1 0 1 1 1
1 0 0 0 1 1 0
BINARY SUBTRACTION
In binary subtraction, the binary number of lower value is subtracted from the binary number of
higher value. The following 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. The rules for binary subtraction:
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
1 0 0 0
– 1 1 1
0 0 0 1
Life Skills & Values
Self Reflection
Your classmate is facing trouble in understanding the different number systems. He is having a hard
Self Reflection
time doing calculations and converting numbers into different number systems. Will you help him by
teaching all the steps in detail?
12 Premium Edition-VII

