Convert -1 010 101 108 to a Signed Binary in One's (1's) Complement Representation

How to convert decimal number -1 010 101 108(10) to a signed binary in one's (1's) complement representation

What are the steps to convert decimal number
-1 010 101 108 to a signed binary in one's (1's) complement representation?

  • A signed integer, written in base ten, or a decimal system number, is a number written using the digits 0 through 9 and the sign, which can be positive (+) or negative (-). If positive, the sign is usually not written. A number written in base two, or binary, is a number written using only the digits 0 and 1.

1. Start with the positive version of the number:

|-1 010 101 108| = 1 010 101 108

2. Divide the number repeatedly by 2:

Keep track of each remainder.

Stop when you get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 1 010 101 108 ÷ 2 = 505 050 554 + 0;
  • 505 050 554 ÷ 2 = 252 525 277 + 0;
  • 252 525 277 ÷ 2 = 126 262 638 + 1;
  • 126 262 638 ÷ 2 = 63 131 319 + 0;
  • 63 131 319 ÷ 2 = 31 565 659 + 1;
  • 31 565 659 ÷ 2 = 15 782 829 + 1;
  • 15 782 829 ÷ 2 = 7 891 414 + 1;
  • 7 891 414 ÷ 2 = 3 945 707 + 0;
  • 3 945 707 ÷ 2 = 1 972 853 + 1;
  • 1 972 853 ÷ 2 = 986 426 + 1;
  • 986 426 ÷ 2 = 493 213 + 0;
  • 493 213 ÷ 2 = 246 606 + 1;
  • 246 606 ÷ 2 = 123 303 + 0;
  • 123 303 ÷ 2 = 61 651 + 1;
  • 61 651 ÷ 2 = 30 825 + 1;
  • 30 825 ÷ 2 = 15 412 + 1;
  • 15 412 ÷ 2 = 7 706 + 0;
  • 7 706 ÷ 2 = 3 853 + 0;
  • 3 853 ÷ 2 = 1 926 + 1;
  • 1 926 ÷ 2 = 963 + 0;
  • 963 ÷ 2 = 481 + 1;
  • 481 ÷ 2 = 240 + 1;
  • 240 ÷ 2 = 120 + 0;
  • 120 ÷ 2 = 60 + 0;
  • 60 ÷ 2 = 30 + 0;
  • 30 ÷ 2 = 15 + 0;
  • 15 ÷ 2 = 7 + 1;
  • 7 ÷ 2 = 3 + 1;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

3. Construct the base 2 representation of the positive number:

Take all the remainders starting from the bottom of the list constructed above.

1 010 101 108(10) = 11 1100 0011 0100 1110 1011 0111 0100(2)

4. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 30.

  • A signed binary's bit length must be equal to a power of 2, as of:
  • 21 = 2; 22 = 4; 23 = 8; 24 = 16; 25 = 32; 26 = 64; ...
  • The first bit (the leftmost) indicates the sign:
  • 0 = positive integer number, 1 = negative integer number

The least number that is:

1) a power of 2

2) and is larger than the actual length, 30,

3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)

=== is: 32.


5. Get the positive binary computer representation on 32 bits (4 Bytes):

If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 32.


1 010 101 108(10) = 0011 1100 0011 0100 1110 1011 0111 0100

6. Get the negative integer number representation:

  • To write the negative integer number on 32 bits (4 Bytes), as a signed binary in one's complement representation,

  • ... Reverse all the bits from 0 to 1 and from 1 to 0 (flip the digits).


-1 010 101 108(10) = !(0011 1100 0011 0100 1110 1011 0111 0100)


Decimal Number -1 010 101 108(10) converted to signed binary in one's complement representation:

-1 010 101 108(10) = 1100 0011 1100 1011 0001 0100 1000 1011

Spaces were used to group digits: for binary, by 4, for decimal, by 3.

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How to convert signed integers from the decimal system to signed binary in one's complement representation

Follow the steps below to convert a signed base 10 integer number to signed binary in one's complement representation:

  • 1. If the number to be converted is negative, start with the positive version of the number.
  • 2. Divide repeatedly by 2 the positive representation of the integer number that is to be converted to binary, keeping track of each remainder, until we get a quotient that is equal to ZERO.
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above. Thus, the last remainder of the divisions becomes the first symbol (the leftmost) of the base two number, while the first remainder becomes the last symbol (the rightmost).
  • 4. Binary numbers represented in computer language must have 4, 8, 16, 32, 64, ... bit length (a power of 2) - if needed, fill in '0' bits in front (to the left) of the base 2 number calculated above, up to the right length; this way the first bit (leftmost) will always be '0', correctly representing a positive number.
  • 5. To get the negative integer number representation in signed binary one's complement, replace all '0' bits with '1's and all '1' bits with '0's.

Example: convert the negative number -49 from the decimal system (base ten) to signed binary one's complement:

  • 1. Start with the positive version of the number: |-49| = 49
  • 2. Divide repeatedly 49 by 2, keeping track of each remainder:
    • division = quotient + remainder
    • 49 ÷ 2 = 24 + 1
    • 24 ÷ 2 = 12 + 0
    • 12 ÷ 2 = 6 + 0
    • 6 ÷ 2 = 3 + 0
    • 3 ÷ 2 = 1 + 1
    • 1 ÷ 2 = 0 + 1
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above:
    49(10) = 11 0001(2)
  • 4. The actual bit length of base 2 representation is 6, so the positive binary computer representation of a signed binary will take in this case 8 bits (the least power of 2 that is larger than 6) - add '0's in front of the base 2 number, up to the required length:
    49(10) = 0011 0001(2)
  • 5. To get the negative integer number representation in signed binary one's complement, replace all '0' bits with '1's and all '1' bits with '0's:
    -49(10) = 1100 1110
  • Number -49(10), signed integer, converted from the decimal system (base 10) to signed binary in one's complement representation = 1100 1110