Convert 111 000 101 110 076 to a Signed Binary in Two's (2's) Complement Representation

How to convert decimal number 111 000 101 110 076(10) to a signed binary in two's (2's) complement representation

What are the steps to convert decimal number
111 000 101 110 076 to a signed binary in two's (2'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.

We stop when we get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 111 000 101 110 076 ÷ 2 = 55 500 050 555 038 + 0;
  • 55 500 050 555 038 ÷ 2 = 27 750 025 277 519 + 0;
  • 27 750 025 277 519 ÷ 2 = 13 875 012 638 759 + 1;
  • 13 875 012 638 759 ÷ 2 = 6 937 506 319 379 + 1;
  • 6 937 506 319 379 ÷ 2 = 3 468 753 159 689 + 1;
  • 3 468 753 159 689 ÷ 2 = 1 734 376 579 844 + 1;
  • 1 734 376 579 844 ÷ 2 = 867 188 289 922 + 0;
  • 867 188 289 922 ÷ 2 = 433 594 144 961 + 0;
  • 433 594 144 961 ÷ 2 = 216 797 072 480 + 1;
  • 216 797 072 480 ÷ 2 = 108 398 536 240 + 0;
  • 108 398 536 240 ÷ 2 = 54 199 268 120 + 0;
  • 54 199 268 120 ÷ 2 = 27 099 634 060 + 0;
  • 27 099 634 060 ÷ 2 = 13 549 817 030 + 0;
  • 13 549 817 030 ÷ 2 = 6 774 908 515 + 0;
  • 6 774 908 515 ÷ 2 = 3 387 454 257 + 1;
  • 3 387 454 257 ÷ 2 = 1 693 727 128 + 1;
  • 1 693 727 128 ÷ 2 = 846 863 564 + 0;
  • 846 863 564 ÷ 2 = 423 431 782 + 0;
  • 423 431 782 ÷ 2 = 211 715 891 + 0;
  • 211 715 891 ÷ 2 = 105 857 945 + 1;
  • 105 857 945 ÷ 2 = 52 928 972 + 1;
  • 52 928 972 ÷ 2 = 26 464 486 + 0;
  • 26 464 486 ÷ 2 = 13 232 243 + 0;
  • 13 232 243 ÷ 2 = 6 616 121 + 1;
  • 6 616 121 ÷ 2 = 3 308 060 + 1;
  • 3 308 060 ÷ 2 = 1 654 030 + 0;
  • 1 654 030 ÷ 2 = 827 015 + 0;
  • 827 015 ÷ 2 = 413 507 + 1;
  • 413 507 ÷ 2 = 206 753 + 1;
  • 206 753 ÷ 2 = 103 376 + 1;
  • 103 376 ÷ 2 = 51 688 + 0;
  • 51 688 ÷ 2 = 25 844 + 0;
  • 25 844 ÷ 2 = 12 922 + 0;
  • 12 922 ÷ 2 = 6 461 + 0;
  • 6 461 ÷ 2 = 3 230 + 1;
  • 3 230 ÷ 2 = 1 615 + 0;
  • 1 615 ÷ 2 = 807 + 1;
  • 807 ÷ 2 = 403 + 1;
  • 403 ÷ 2 = 201 + 1;
  • 201 ÷ 2 = 100 + 1;
  • 100 ÷ 2 = 50 + 0;
  • 50 ÷ 2 = 25 + 0;
  • 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.

111 000 101 110 076(10) = 110 0100 1111 0100 0011 1001 1001 1000 1100 0001 0011 1100(2)

3. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 47.

  • 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, 47,

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 111 000 101 110 076(10) converted to signed binary in two's complement representation:

111 000 101 110 076(10) = 0000 0000 0000 0000 0110 0100 1111 0100 0011 1001 1001 1000 1100 0001 0011 1100

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


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

Follow the steps below to convert a signed base 10 integer number to signed binary in two'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, keeping track of each remainder, until we get a quotient that is 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, add extra bits on 0 in front (to the left) of the base 2 number above, up to the required length, so that the first bit (the leftmost) will 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 1s and all 1 bits with 0s (reversing the digits).
  • 6. To get the negative integer number, in signed binary two's complement representation, add 1 to the number above.

Example: convert the negative number -60 from the decimal system (base ten) to signed binary in two's complement:

  • 1. Start with the positive version of the number: |-60| = 60
  • 2. Divide repeatedly 60 by 2, keeping track of each remainder:
    • division = quotient + remainder
    • 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, by taking all the remainders starting from the bottom of the list constructed above:
    60(10) = 11 1100(2)
  • 4. Bit length of base 2 representation number is 6, so the positive binary computer representation of a signed binary will take in this particular case 8 bits (the least power of 2 larger than 6) - add extra 0 digits in front of the base 2 number, up to the required length:
    60(10) = 0011 1100(2)
  • 5. To get the negative integer number representation in signed binary one's complement, replace all the 0 bits with 1s and all 1 bits with 0s (reversing the digits):
    !(0011 1100) = 1100 0011
  • 6. To get the negative integer number, signed binary in two's complement representation, add 1 to the number above:
    -60(10) = 1100 0011 + 1 = 1100 0100
  • Number -60(10), signed integer, converted from decimal system (base 10) to signed binary two's complement representation = 1100 0100