Curated OER
Mary Ann Patten: Clipper Ship Heroine
In two groups, students research the history and current building of clipper ships. In this inquiry lesson, students present information and compare and contrast the technological revolution with the development of clipper ships....
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Whole Number
[Free Registration/Login may be required to access all resource tools.] Round and find compatible whole numbers in order to estimate products and quotients.