Unsigned: Integer ↗ Binary: 1 111 111 111 111 123 Convert the Positive Integer (Whole Number) From Base Ten (10) To Base Two (2), Conversion and Writing of Decimal System Number as Unsigned Binary Code

Unsigned (positive) integer number 1 111 111 111 111 123(10)
converted and written as an unsigned binary (base 2) = ?

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;
  • 1 111 111 111 111 123 ÷ 2 = 555 555 555 555 561 + 1;
  • 555 555 555 555 561 ÷ 2 = 277 777 777 777 780 + 1;
  • 277 777 777 777 780 ÷ 2 = 138 888 888 888 890 + 0;
  • 138 888 888 888 890 ÷ 2 = 69 444 444 444 445 + 0;
  • 69 444 444 444 445 ÷ 2 = 34 722 222 222 222 + 1;
  • 34 722 222 222 222 ÷ 2 = 17 361 111 111 111 + 0;
  • 17 361 111 111 111 ÷ 2 = 8 680 555 555 555 + 1;
  • 8 680 555 555 555 ÷ 2 = 4 340 277 777 777 + 1;
  • 4 340 277 777 777 ÷ 2 = 2 170 138 888 888 + 1;
  • 2 170 138 888 888 ÷ 2 = 1 085 069 444 444 + 0;
  • 1 085 069 444 444 ÷ 2 = 542 534 722 222 + 0;
  • 542 534 722 222 ÷ 2 = 271 267 361 111 + 0;
  • 271 267 361 111 ÷ 2 = 135 633 680 555 + 1;
  • 135 633 680 555 ÷ 2 = 67 816 840 277 + 1;
  • 67 816 840 277 ÷ 2 = 33 908 420 138 + 1;
  • 33 908 420 138 ÷ 2 = 16 954 210 069 + 0;
  • 16 954 210 069 ÷ 2 = 8 477 105 034 + 1;
  • 8 477 105 034 ÷ 2 = 4 238 552 517 + 0;
  • 4 238 552 517 ÷ 2 = 2 119 276 258 + 1;
  • 2 119 276 258 ÷ 2 = 1 059 638 129 + 0;
  • 1 059 638 129 ÷ 2 = 529 819 064 + 1;
  • 529 819 064 ÷ 2 = 264 909 532 + 0;
  • 264 909 532 ÷ 2 = 132 454 766 + 0;
  • 132 454 766 ÷ 2 = 66 227 383 + 0;
  • 66 227 383 ÷ 2 = 33 113 691 + 1;
  • 33 113 691 ÷ 2 = 16 556 845 + 1;
  • 16 556 845 ÷ 2 = 8 278 422 + 1;
  • 8 278 422 ÷ 2 = 4 139 211 + 0;
  • 4 139 211 ÷ 2 = 2 069 605 + 1;
  • 2 069 605 ÷ 2 = 1 034 802 + 1;
  • 1 034 802 ÷ 2 = 517 401 + 0;
  • 517 401 ÷ 2 = 258 700 + 1;
  • 258 700 ÷ 2 = 129 350 + 0;
  • 129 350 ÷ 2 = 64 675 + 0;
  • 64 675 ÷ 2 = 32 337 + 1;
  • 32 337 ÷ 2 = 16 168 + 1;
  • 16 168 ÷ 2 = 8 084 + 0;
  • 8 084 ÷ 2 = 4 042 + 0;
  • 4 042 ÷ 2 = 2 021 + 0;
  • 2 021 ÷ 2 = 1 010 + 1;
  • 1 010 ÷ 2 = 505 + 0;
  • 505 ÷ 2 = 252 + 1;
  • 252 ÷ 2 = 126 + 0;
  • 126 ÷ 2 = 63 + 0;
  • 63 ÷ 2 = 31 + 1;
  • 31 ÷ 2 = 15 + 1;
  • 15 ÷ 2 = 7 + 1;
  • 7 ÷ 2 = 3 + 1;
  • 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.


Number 1 111 111 111 111 123(10), a positive integer number (with no sign),
converted from decimal system (from base 10)
and written as an unsigned binary (in base 2):

1 111 111 111 111 123(10) = 11 1111 0010 1000 1100 1011 0111 0001 0101 0111 0001 1101 0011(2)

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

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How to convert unsigned integer numbers (positive) from decimal system (base 10) to binary = simply convert from base ten to base two

Follow the steps below to convert a base ten unsigned integer number to base two:

  • 1. Divide repeatedly by 2 the positive integer number that has to be converted to binary, keeping track of each remainder, until we get a QUOTIENT that is equal to ZERO.
  • 2. Construct the base 2 representation of the positive integer 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).

Example: convert the positive integer number 55 from decimal system (base ten) to binary code (base two):

  • 1. Divide repeatedly 55 by 2, keeping track of each remainder, until we get a quotient that is equal to zero:
    • division = quotient + remainder;
    • 55 ÷ 2 = 27 + 1;
    • 27 ÷ 2 = 13 + 1;
    • 13 ÷ 2 = 6 + 1;
    • 6 ÷ 2 = 3 + 0;
    • 3 ÷ 2 = 1 + 1;
    • 1 ÷ 2 = 0 + 1;
  • 2. Construct the base 2 representation of the positive integer number, by taking all the remainders starting from the bottom of the list constructed above:
    55(10) = 11 0111(2)
  • Number 5510, positive integer (no sign), converted from decimal system (base 10) to unsigned binary (base 2) = 11 0111(2)