Paris Paris order some pizza for party 4.5 pieces were eaten at the party there were at least five and a half whole pizza left over how many pieces did Perry's parents order

4.5 pieces wer eaten

there were at least 5 and 1/2 pizza left over

assuming you mean that 5 and 1/2 pieces were left

so we add them and get

4.5+5 and 1/2

5 and 1/2=5.5

4.5+5.5=4+5+0.5+0.5=9+1=10

they ordered at least 10 pieces