Convert 111 110 110 029 to a Signed Binary in One's (1's) Complement Representation

How to convert decimal number 111 110 110 029(10) to a signed binary in one's (1's) complement representation

What are the steps to convert decimal number
111 110 110 029 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. 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;
  • 111 110 110 029 ÷ 2 = 55 555 055 014 + 1;
  • 55 555 055 014 ÷ 2 = 27 777 527 507 + 0;
  • 27 777 527 507 ÷ 2 = 13 888 763 753 + 1;
  • 13 888 763 753 ÷ 2 = 6 944 381 876 + 1;
  • 6 944 381 876 ÷ 2 = 3 472 190 938 + 0;
  • 3 472 190 938 ÷ 2 = 1 736 095 469 + 0;
  • 1 736 095 469 ÷ 2 = 868 047 734 + 1;
  • 868 047 734 ÷ 2 = 434 023 867 + 0;
  • 434 023 867 ÷ 2 = 217 011 933 + 1;
  • 217 011 933 ÷ 2 = 108 505 966 + 1;
  • 108 505 966 ÷ 2 = 54 252 983 + 0;
  • 54 252 983 ÷ 2 = 27 126 491 + 1;
  • 27 126 491 ÷ 2 = 13 563 245 + 1;
  • 13 563 245 ÷ 2 = 6 781 622 + 1;
  • 6 781 622 ÷ 2 = 3 390 811 + 0;
  • 3 390 811 ÷ 2 = 1 695 405 + 1;
  • 1 695 405 ÷ 2 = 847 702 + 1;
  • 847 702 ÷ 2 = 423 851 + 0;
  • 423 851 ÷ 2 = 211 925 + 1;
  • 211 925 ÷ 2 = 105 962 + 1;
  • 105 962 ÷ 2 = 52 981 + 0;
  • 52 981 ÷ 2 = 26 490 + 1;
  • 26 490 ÷ 2 = 13 245 + 0;
  • 13 245 ÷ 2 = 6 622 + 1;
  • 6 622 ÷ 2 = 3 311 + 0;
  • 3 311 ÷ 2 = 1 655 + 1;
  • 1 655 ÷ 2 = 827 + 1;
  • 827 ÷ 2 = 413 + 1;
  • 413 ÷ 2 = 206 + 1;
  • 206 ÷ 2 = 103 + 0;
  • 103 ÷ 2 = 51 + 1;
  • 51 ÷ 2 = 25 + 1;
  • 25 ÷ 2 = 12 + 1;
  • 12 ÷ 2 = 6 + 0;
  • 6 ÷ 2 = 3 + 0;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

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

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

111 110 110 029(10) = 1 1001 1101 1110 1010 1101 1011 1011 0100 1101(2)

3. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 37.

  • 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, 37,

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

=== is: 64.


4. Get the positive binary computer representation on 64 bits (8 Bytes):

If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 64.


Decimal Number 111 110 110 029(10) converted to signed binary in one's complement representation:

111 110 110 029(10) = 0000 0000 0000 0000 0000 0000 0001 1001 1101 1110 1010 1101 1011 1011 0100 1101

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