Inspired by the work of Magdeline Lampert, interactive problems offer educators a fun tool to help learners think about "mathematical principles" within the familiar context of coinage. We love her idea that playing with combinations and recombinations of denominations promotes engagement with multiplicative thinking, and have produced this as a result.

With Glean PEMDAS (Please Excuse My Dear Aunt Sally), we present a math learning environment to help teachers extend students' understanding of order of operations concepts.

The Multiplication Tool supports the teaching and learning of multi-digit multiplication, a critical elementary math skill that many students have difficulty mastering, but which is essential to success in middle and high school mathematics and beyond.