Decimal to Binary:
The whole decimal number can be converted into binary Number system by repeated divisions by (2). And write the result from bottom to top. A fractional decimal part can be converted into binary by repeated multiplication by (2) and write the result from top to bottom
Example:
Decimal to Octal
Decimal number can be converted into octal number by repeated divisions by 8 and write the result from bottom to top. A fractional decimal part can be converted into octal by repeating multiplications by 8 and write the result from top to bottom. In general a decimal number can be converted into any other system by repeated divisions by phase and write the result from bottom to top. Similarly a fractional decimal part can be converted into any number system by repeated multiplication by base and write the result from top to bottom.
Decimal to Hexa-Decimal
Binary to Decimal
A binary number can be converted into decimal by multiplying each binary digit with its weight and sum the products
Example:
Octal to Decimal
An octal number can be converted into decimal by multiplying each octal digit with its weight and sum the products
Hexa-Decimal to Decimal
Hexadecimal to decimal number can be converted into decimal by multiplying each hexadecimal digit with its weight and sum the products