Convert -520 000 000 113 to a Signed Binary in One's (1's) Complement Representation

How to convert decimal number -520 000 000 113(10) to a signed binary in one's (1's) complement representation

What are the steps to convert decimal number
-520 000 000 113 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:

|-520 000 000 113| = 520 000 000 113

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;
  • 520 000 000 113 ÷ 2 = 260 000 000 056 + 1;
  • 260 000 000 056 ÷ 2 = 130 000 000 028 + 0;
  • 130 000 000 028 ÷ 2 = 65 000 000 014 + 0;
  • 65 000 000 014 ÷ 2 = 32 500 000 007 + 0;
  • 32 500 000 007 ÷ 2 = 16 250 000 003 + 1;
  • 16 250 000 003 ÷ 2 = 8 125 000 001 + 1;
  • 8 125 000 001 ÷ 2 = 4 062 500 000 + 1;
  • 4 062 500 000 ÷ 2 = 2 031 250 000 + 0;
  • 2 031 250 000 ÷ 2 = 1 015 625 000 + 0;
  • 1 015 625 000 ÷ 2 = 507 812 500 + 0;
  • 507 812 500 ÷ 2 = 253 906 250 + 0;
  • 253 906 250 ÷ 2 = 126 953 125 + 0;
  • 126 953 125 ÷ 2 = 63 476 562 + 1;
  • 63 476 562 ÷ 2 = 31 738 281 + 0;
  • 31 738 281 ÷ 2 = 15 869 140 + 1;
  • 15 869 140 ÷ 2 = 7 934 570 + 0;
  • 7 934 570 ÷ 2 = 3 967 285 + 0;
  • 3 967 285 ÷ 2 = 1 983 642 + 1;
  • 1 983 642 ÷ 2 = 991 821 + 0;
  • 991 821 ÷ 2 = 495 910 + 1;
  • 495 910 ÷ 2 = 247 955 + 0;
  • 247 955 ÷ 2 = 123 977 + 1;
  • 123 977 ÷ 2 = 61 988 + 1;
  • 61 988 ÷ 2 = 30 994 + 0;
  • 30 994 ÷ 2 = 15 497 + 0;
  • 15 497 ÷ 2 = 7 748 + 1;
  • 7 748 ÷ 2 = 3 874 + 0;
  • 3 874 ÷ 2 = 1 937 + 0;
  • 1 937 ÷ 2 = 968 + 1;
  • 968 ÷ 2 = 484 + 0;
  • 484 ÷ 2 = 242 + 0;
  • 242 ÷ 2 = 121 + 0;
  • 121 ÷ 2 = 60 + 1;
  • 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.

520 000 000 113(10) = 111 1001 0001 0010 0110 1010 0101 0000 0111 0001(2)

4. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 39.

  • 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, 39,

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

=== is: 64.


5. 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.


520 000 000 113(10) = 0000 0000 0000 0000 0000 0000 0111 1001 0001 0010 0110 1010 0101 0000 0111 0001

6. Get the negative integer number representation:

  • To write the negative integer number on 64 bits (8 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).


-520 000 000 113(10) = !(0000 0000 0000 0000 0000 0000 0111 1001 0001 0010 0110 1010 0101 0000 0111 0001)


Decimal Number -520 000 000 113(10) converted to signed binary in one's complement representation:

-520 000 000 113(10) = 1111 1111 1111 1111 1111 1111 1000 0110 1110 1101 1001 0101 1010 1111 1000 1110

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