Is it ok for a cashier to write down front debit card number on receipt?

medo.

New member
Today i was at the mall, Body Central/ Clothing department store, and i checked out with a debit card.
She swiped it on her computer and i entered my pin on a separate pad, she then wrote my front card number on top of the receipt? (her copy)

Why is that, should i be worried? Why does she need the front number of the card?
I've never seen any other stores do this, even though their checkouts look very "old".
 
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