Conversion from Binary to Decimal
Expand the number given in binary form in the power of 2 and sum the values, the result which we will get will be in the decimal form. For example- 
Conversion from Decimal to Binary
Divide the number by 2 and take only the remainder, if division is completed than take only the remainder which gives the binary number.
Example
∴ (87)10 = (1110101)2
