It seems the post office has run out of stamps! Learners build all the values of postage available if the post office only sells five- and seven-cent stamps. The task provides an opportunity to create an expression in two variables and...

Fifth graders investigate factors by utilizing mathematical terms.   In this number sense lesson, 5th graders discuss and define terms such as factors, multiples, and denominators.  Students create a Venn Diagram when...