Starting with the rightmost, multiply each binary digit by an increasing power of two, and add the results. Like this:
0 x 1 = 0
1 x 2 = 2
1 x 4 = 4
1 x 8 = 8
1 x 16 = 16
0 x 32 = 0
0 x 64 = 0
1 x 128 = 128
total = 158
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158.
In binary there are only 2 digits, 0 & 1. Each digit working from right to left is a multiple of a power of 2 (starting at 0), with the power increasing by 1 as we move a digit to the left (this is the same principle as in decimal, except in decimal there are 10 digits and each digit is a multiple of a power of 10).
So, in binary this number actually means (working from right to left):
(0 * 20) + (1 * 21) + (1 * 22) + (1 * 23) + (1 * 24) + (0 * 25) + (0 * 26) + (1 * 27)
which equals 0 + 2 + 4 + 8 + 16 + 0 + 0 + 128
which equals 158 (one hundred and fifty eight) in decimal.
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The binary equivalent of the decimal number 63 is 111111.
The binary number 11.1 in decimal would be 3.5
It is 155.
You can easily convert decimal to binary in the scientific calculator - for example, the scientific calculator found in Windows. In this case, type the number in decimal, then click on "binary" to convert to binary.
The decimal number 25 is expressed in binary as 11001.