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Validation of Hong Kong ID Card Number with Check Digit

Learn about validating Hong Kong Identity Card numbers, including the conversion of letters to digits, multiplication process, and the importance of the check digit for data accuracy.

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Validation of Hong Kong ID Card Number with Check Digit

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  1. More to Learn Check digit • It is used to check whether a number is valid. • Both ISBN and Hong Kong Identity Card numbers contain a check digit for data validation.

  2. More to Learn Validation of Hong Kong Identity Card number with check digit • The Hong Kong Identity Card number is a unique identification number assigned to each resident of Hong Kong. • Each Hong Kong Identity Card number consists of 7 digits and a letter, such as D288754(2). • In the process of validation, the letter must be converted into a digit, such as A to 1, B to 2, C to 3 and so on. • Each of the digits is multiplied by a number ranging from 8 to 2. • The resulting sum of the products plus the check digit must be divisible by 11 for a valid HKID. • D288754(2) is a valid HKID number as the sum of the products is 187 which is divisible by 11.

  3. More to Learn Validation of Hong Kong Identity Card number with check digit Validation of HKID Card number D288754(2) ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ 32 + 14 + 48 + 40 + 28 + 15 + 8 + 2 = 187 187 ÷ 11 = 17

  4. More to Learn Validation of Hong Kong Identity Card number with check digit Validation of HKID Card number D288754(2) ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ 32 + 14 + 48 + 40 + 28 + 15 + 8 + 2 = 187 187 ÷ 11 = 17

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