#examooc: GCSE Computer Science for free

Choose from the following to help you learn:

Books

CAMBRIDGE Computer Science: 
Page 93 Section: "Modulus check digit"
ROBSON & HEATHCOTE Computer Science (9-1):
Page 141. Section "Check digits".
SUSAN ROBSON GCSE Computing(3rd edition): 
n/a
SUSAN ROBSON GCSE Computing(2012): 
n/a
AXSIED GCSE Computer Science (3rd edition):
n/a
ROUSE & O'BYRNE GCSE(9-1) Computer Science:
Pages 155. Section "Check digits" to the top of Page 156. 

Web Sites

• BBC Bitesize: Page 6 Check digits  
• Wikipedia: Check digit (1 article)
• Simple Wikipedia: Checksum (1 article)
  
• Teach-ICT: Section 12: Check Digits
  

YouTube

• 0612TV: Watch all (6:58). Check Digits
  
• BBC Earth Lab: Watch all (4:09), or from (3:00). James May explains Check Digits on bar codes.
  
• IGCSE Computer Science: Watch from 0:18 to 6:02, check digits.