Convert 100 222 222 929 to a Signed Binary in One's (1's) Complement Representation

How to convert decimal number 100 222 222 929(10) to a signed binary in one's (1's) complement representation

What are the steps to convert decimal number
100 222 222 929 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;
  • 100 222 222 929 ÷ 2 = 50 111 111 464 + 1;
  • 50 111 111 464 ÷ 2 = 25 055 555 732 + 0;
  • 25 055 555 732 ÷ 2 = 12 527 777 866 + 0;
  • 12 527 777 866 ÷ 2 = 6 263 888 933 + 0;
  • 6 263 888 933 ÷ 2 = 3 131 944 466 + 1;
  • 3 131 944 466 ÷ 2 = 1 565 972 233 + 0;
  • 1 565 972 233 ÷ 2 = 782 986 116 + 1;
  • 782 986 116 ÷ 2 = 391 493 058 + 0;
  • 391 493 058 ÷ 2 = 195 746 529 + 0;
  • 195 746 529 ÷ 2 = 97 873 264 + 1;
  • 97 873 264 ÷ 2 = 48 936 632 + 0;
  • 48 936 632 ÷ 2 = 24 468 316 + 0;
  • 24 468 316 ÷ 2 = 12 234 158 + 0;
  • 12 234 158 ÷ 2 = 6 117 079 + 0;
  • 6 117 079 ÷ 2 = 3 058 539 + 1;
  • 3 058 539 ÷ 2 = 1 529 269 + 1;
  • 1 529 269 ÷ 2 = 764 634 + 1;
  • 764 634 ÷ 2 = 382 317 + 0;
  • 382 317 ÷ 2 = 191 158 + 1;
  • 191 158 ÷ 2 = 95 579 + 0;
  • 95 579 ÷ 2 = 47 789 + 1;
  • 47 789 ÷ 2 = 23 894 + 1;
  • 23 894 ÷ 2 = 11 947 + 0;
  • 11 947 ÷ 2 = 5 973 + 1;
  • 5 973 ÷ 2 = 2 986 + 1;
  • 2 986 ÷ 2 = 1 493 + 0;
  • 1 493 ÷ 2 = 746 + 1;
  • 746 ÷ 2 = 373 + 0;
  • 373 ÷ 2 = 186 + 1;
  • 186 ÷ 2 = 93 + 0;
  • 93 ÷ 2 = 46 + 1;
  • 46 ÷ 2 = 23 + 0;
  • 23 ÷ 2 = 11 + 1;
  • 11 ÷ 2 = 5 + 1;
  • 5 ÷ 2 = 2 + 1;
  • 2 ÷ 2 = 1 + 0;
  • 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.

100 222 222 929(10) = 1 0111 0101 0101 1011 0101 1100 0010 0101 0001(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 100 222 222 929(10) converted to signed binary in one's complement representation:

100 222 222 929(10) = 0000 0000 0000 0000 0000 0000 0001 0111 0101 0101 1011 0101 1100 0010 0101 0001

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