Math: Key to Decimals, Book 4; section on Averages. It makes perfect sense to put this section into a workbook on decimals, because so much of the arithmetic you do with averages turns into decimals! The book also includes some bar graph averaging. I will probably assign a page of word problems ("Averages in Sports") as homework. (These are the same sample pages you can download here.)
Readaloud: The Pushcart War, chapters 34-36. (End of the book!)
Roman history review: watch this video, but just from about 18 minutes on, the parts about Brutus and Cassius (mostly in good taste--Leon Garfield wrote the screenplay--but it's not for little ones):
Augustus Caesar's World: "Antony and Octavian Divide the World." We also read the next section, "Horace and the Country Mouse."
Archimedes and the Door of Science: "Archimedes and King Hiero's Crown"
1. Read to yourself: pages 54 to the top of page 60.
2. Narrate orally.
3. Read together: pages 60-61.
4. Find a pencil stub between 2 and 3 inches long, and get a glass of water and a bottle of rubbing alcohol. Do the experiment on page 62.
5. Read together: pages 63-64 (first half of the page), which explains about hydrometers.
For extra credit: read this article about whether or not the Eureka story really happened...or at least happened as the legend says.