It is time to expose the secret double life of subtraction. It all comes down to that foundational number sense we work with students to develop as they grow as elementary school mathematicians. We give students the opportunity to build…
The final Books and Big Ideas of the 2025-2026 school year has taken place, and the story so carefully chosen by our incredible Lower School librarian was The Magical Yet by Angela DiTerlizzi. A math educator could not have wished…
A true story “My dad says mistakes are good,” a second grader shared. “He said they help you learn.” We were discussing the importance of giving hard things a try, even if we don’t always succeed. “It is sort of…
Sometimes the best definition is so brief and obvious…if you were to ask me just yesterday how to define fact fluency I would have given you a mouthful of alphabet soup teacher-ese. This morning, over coffee, shuffling through some of…
A note on the name of this blog. I listened to the most beautiful description of what we want to build in mathematicians several weeks ago. A brilliant colleague of mine (Pete Prince, to be specific, who is co-head of…