Let's round off the quantities to the nearest 100.
Rounding off 5281, we get 5300 ...(0.5 marks)
(As the tens place digit is 8, which is greater than 5)
Similarly, rounding off 3491, we get 3500 (As the tens place digit is 9, which is greater than 5) ...(0.5 marks)
Therefore, approximate total number of packets sold during the weekend = 3500 + 5300 = 8800 packets ...(1 mark)