Harold and Donald are playing a card game with cards that each have a number written on it. Each player chooses five cards. The person whose five cards have values with a sum closest to zero wins.

Part A
Harold's first four cards are shown here:
5 1/4, -6 2/3, 10.6, -7 1/6

What would the value of Harold's fifth card need to be in order to guarantee that he wins or ties? Provide evidence to support your answer. L-LINE UP A PLAN (& ESTIMATE AN ANSWER) - (Make sense of the information before starting to answer. Your plan should be in words, not numbers. What operations will you use?)