<h3>The answer is:</h3><h2>1/3</h2><h2 />
What information do I already have?
Mr. Wong's total workday is 3/3 because 3/3 = 1.
We already know Mr. Wong spent 2/3 of his workday selling products.
Now, the word problem tells us that he spent <em>the rest of his day</em> making phone calls. "The rest of his day" is a key sentence/phrase!
What does "...spent the rest of his day..." mean anyways?
It means that you should subtract!
Therefore:
3/3 - 2/3 = 1/3
There's your answer!