Editing Luhn algorithm (section)

=== Example for validating check digit ===

# Drop the check digit (last digit) of the number to validate. (e.g. 17893729974 &rarr; 1789372997)
# Calculate the check digit (see above)
# Compare your result with the original check digit. If both numbers match, the result is valid. {{nowrap|1=(e.g. (givenCheckDigit = calculatedCheckDigit) &hArr; (isValidCheckDigit)).}}