001100
Starting from the right the position value of each digit is as follows
0 x 2 to power zero = 0 (mult by zero, does not matter what 2 is powered to)
0 x 2 to power one = 0 (mult by zero, does not matter what 2 is powered to)
1 x 2 to power two = 4
1 x 2 to power three = 8
0 x 2 to power four = 0 (mult by zero, does not matter what 2 is powered to)
0 x 2 to power five = 0 (mult by zero, does not matter what 2 is powered to)
Adding all we get the decimal equivalent of 12
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10
110001.01
15 = 1111
When written as a binary number, the decimal number 63 is: 1 1 1 1 1 1
If you use Windows, you can use the Windows calculator to convert from decimal to binary. Change to scientific mode, be sure the calculator is in decimal, type the decimal number, and switch to binary. If you are practicing decimal to binary conversion, this is a great tool to verify that you have done your calculations correctly.