Yeah Christianne wrote:
You should always check your receipt before leaving the store! I add things up in my head as I go so if the total seems off at the register, I check extra carefully. Otherwise, if it seems right, I just glance down the receipt quickly and make sure it all looks fine.

Also because stores will sometimes give you the item for free if it rings up wrong! I think at Kroger it's up to $5, and only for one item if you bought multiples. (They'll obviously refund the difference on the rest.) I can't remember what happens if your item is over the $5, I think maybe you just get $5 back.