Multiple choice

Barcodes work by...

  1. Adding all the numbers together to see if the result is the last digit

  2. Subtracting all the numbers to see if the result is the last digit

  3. Multiplying all the numbers together to see if the result is the last digit

  4. Barcodes store information using symbols that can vary from lines to dots.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Barcodes represent data visually using varying widths of lines and spaces (or dots), which are then scanned and interpreted by a reader to retrieve the encoded information.

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