Computer Science - Computer Fundamentals - Discussion

3. 

Multiplication of 1112 by 1012 is

[A]. 1100112
[B]. 1000112
[C]. 1111002
[D]. 0001012
[E]. None of the above

Answer: Option B

Explanation:

No answer description available for this question.

Sachin said: (Feb 28, 2011)  
Explanation this question.

Sundar said: (Feb 28, 2011)  
I have a simple idea to solve this kind of problem.

111 --> 7
101 --> 5

7 x 5 = 35

35 --> 100011 is the required answer.

Mamatha said: (Jan 24, 2012)  
111 --> 7
=> (2^0*1)+(2^1*1)+(2^2*1)
=>(1*1)+(2*1)+(4*1)
=>1+2+4
=>7
Same for 101
try it.

Priyanka said: (Jun 2, 2013)  
111
* 101
------
111
0000
+11100
-------
100011
-------

Razo said: (Aug 13, 2014)  
What is the grammar of this summation @Priyanka?

Arun Kumar said: (Mar 11, 2015)  
In binary 1 is written as 001 and 2 is 010, three is 011, 4 is 100, 5 is 101, 6 is 110 and seven is 111 eight is 1000 nine is 1001 and ten is 1010 accordingly 20 is 10100 and 30 is 11110 plus five 101 total would be 10001.

The concept is 1+1=0 and carry forward 1, further if we multiply 7*5=35 it written in binary as 100011 is.

Tauqeer said: (Aug 26, 2016)  
@Sundar: How can 35 become 100011?

Please elaborate.

Soumya said: (Jan 7, 2017)  
Please elaborate the answer in step by step.

Vipandeep Singh said: (Mar 10, 2017)  
@ Tauqeer.

100011= 1*2^5+0*2^4 + 0*2^3+0*2^2 + 1*2^1+1*2^0.
= 32+0+0+0+2+1 = 35.

Bekele said: (May 4, 2017)  
How to change 35 into binary no 100011? Please explain.

Aswathy said: (Oct 13, 2017)  
111->7
101->5
7*5=35
35/2=17 --------------> 35%2=1
17/2=8 --------------> 17%2=1
8/2=4 --------------> 8%2=0
4/2=2 --------------> 4%2=0
2/2=1 --------------> 2%2=0
--------------> 1%2=1

Reading in reverse order we get the answer 100011.

Anirudh said: (Aug 21, 2018)  
111 in decimal is 7 and 101 in decimal is 5.
now multiply 7 and 5 ie. 7*5=35.
Next, convert 35 into binary by using 32-bit representation.
32 16 8 4 2 1.
1 0 0 0 0 1 (32+2+1=35 so put 1 in place of 32,2,1 and 0 in remaining places).

Muhammad Asif said: (Feb 26, 2020)  
7 = 111.
5 = 101.
So simple 5*7 = 35.
Now it will be convert in binary
32 16 8 4 2 1
1 0 0 0 1 1

35=100011.

The same technique will be used if large no occur.

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