Great easy to follow worksheet that will keep any student engaged! Using Luhn’s algorithm you can visually see how to apply this to check the validity of credit card numbers. I set up the table so that students can input a 16 digit number and follow the simple process to check if their number works. I start with a worked example and then I have two sides of blanks for students to use. This is a great lesson for Xmas, Easter or Summer break last lesson if you are looking for a lesson that will ma