# Signed binary two's complement number 1111 1111 1111 1001 converted to decimal system (base ten) signed integer

• 215

0
• 214

0
• 213

0
• 212

0
• 211

0
• 210

0
• 29

0
• 28

0
• 27

0
• 26

0
• 25

0
• 24

0
• 23

0
• 22

1
• 21

1
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1

## Latest binary numbers in two's complement representation converted to signed integers in decimal system (base ten)

 1111 1111 1111 1001 = -7 Oct 28 12:03 UTC (GMT) 1111 1011 1111 1111 1111 1111 1111 0110 = -67,108,874 Oct 28 12:02 UTC (GMT) 1011 1110 1001 0110 = -16,746 Oct 28 12:01 UTC (GMT) 0000 0000 1111 1111 0111 0110 1110 0111 = 16,742,119 Oct 28 12:01 UTC (GMT) 1110 0000 0001 0110 = -8,170 Oct 28 12:01 UTC (GMT) 1000 1110 1100 1110 = -28,978 Oct 28 12:00 UTC (GMT) 1111 1100 = -4 Oct 28 12:00 UTC (GMT) 1001 0101 0011 0011 = -27,341 Oct 28 11:59 UTC (GMT) 0100 1010 = 74 Oct 28 11:59 UTC (GMT) 0000 0000 0111 1111 1111 1111 1101 0011 = 8,388,563 Oct 28 11:59 UTC (GMT) 1101 1001 = -39 Oct 28 11:58 UTC (GMT) 1010 1010 = -86 Oct 28 11:58 UTC (GMT) 0110 0110 1111 0101 = 26,357 Oct 28 11:58 UTC (GMT) All the converted signed binary two's complement numbers

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

### To understand how to convert a signed binary number in two's complement representation from the binary system to decimal (base ten), the easiest way is to do it by an example - convert binary, 1101 1110, to base ten:

• In a signed binary two's complement, first bit (leftmost) indicates the sign, 1 = negative, 0 = positive. The first bit is 1, so our number is negative.
• Get the signed binary representation in one's complement, subtract 1 from the initial number:
1101 1110 - 1 = 1101 1101
• Get the binary representation of the positive number, flip all the bits in the signed binary one's complement representation (reversing the digits) - replace the bits set on 1 with 0s and the bits on 0 with 1s:
!(1101 1101) = 0010 0010
• Write bellow the positive binary number representation in base two, and above each bit that makes up the binary number write the corresponding power of 2 (numeral base) that its place value represents, starting with zero, from the right of the number (rightmost bit), walking to the left of the number, increasing each corresonding power of 2 by exactly one unit:
•  powers of 2: 7 6 5 4 3 2 1 0 digits: 0 0 1 0 0 0 1 0
• Build the representation of the positive number in base 10, by taking each digit of the binary number, multiplying it by the corresponding power of 2 and then adding all the terms up: