When I taught 4th grade, I downloaded jpegs of Spanish gold doubloons from the internet. I printed them out, went to Office Max, and had multiple color copies made. I pasted the paper images to cardboard and cut them out. I then used these "coins" to teach equivalent fractions.
The coins were cut in 1/2, 1/4, and 1/8 pieces as well as 1/3, 1/6, and 1/9th.
In language arts, students learned about the nautical flags that were used to communicate during the age of sail. Students created their own nautical flags.
In science, students learned how to use string and pulleys to create lanyards for raising the nautical flags made in language arts.
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