PPT Slide
3) (8 pts) Use the (decimal) check digit method to calculate the check-digit for 636. If the number received at destination is 6361, explain why it will be detected as being in error.
M = 636. Multiply by 10 => 6360
Divide by 9, remainder = 0.
Subtract from 9 => check digit = 9
Number transmitted = T = 6369
When 6361 is received, the receiver divides it by 9 and finds the remainder as 1. But 9 - 1 = 8 which should have been the check digit, whereas it finds that 1 is the check digit. Therefore it flags an error.