1. The problem is to convert the decimal number 250 into its octal equivalent. 2. The formula or method used for decimal to octal conversion is to repeatedly divide the decimal number by 8 and record the remainders. 3. Important rule: The octal number is formed by reading the remainders from the last division to the first. 4. Start dividing 250 by 8: - $250 \div 8 = 31$ remainder $2$ - $31 \div 8 = 3$ remainder $7$ - $3 \div 8 = 0$ remainder $3$ 5. Reading the remainders from bottom to top gives the octal number: $372$. 6. Therefore, the decimal number 250 is equal to the octal number $372$.