You can use the Windows calculator to do the conversions. If you want to learn how to do it yourself:
To convert binary to decimal, multiply the right-most digit with 1, the second digit (from the right) with 2, the third with 4, etc.
To convert to octal, group the bits from the right to the left, in groups of 3. Convert each group to a decimal digit.
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Binary 110111 is equivalent to decimal 55.
Convert 189 to binary number
13 in decimal = 1101 in binary.
110010000
It is 100011.