This task best fits 3.NF.A.3.a-b as an introduction to equivalent fractions.
Act 1
What did you notice? What do you wonder?
Focus Question: How many will go on each plate so that everyone gets the same amount?
Act 2
How many full bars were there?
Act 3
Extension:
What if the bars were cut in fourths and eighths?
mscastillosmath 
The act 2 link is broken in this task.
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the act 2 link is not working. How many full bars were there?
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Thank you! I have updated it:)
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