Hi, Jessica. We begin area and cubic measures (volume or ) in a hands-on way in the Weights & Measurements section of Book 3. In Book 4, we add to that in the Weights & Measurements section by learning and making those measures using the metric system. Book 5 reviews both area and cubic measures along with working with these measures using decimals.
I’m not sure how this aligns with Strayer-Upton as I didn’t look at their S&S while writing the elementary series. It works well with the series and having the students ready for algebra.
I hope this information is helpful for you.
Richele
Hope that helps.