Learn how GROUPBY passes both subset and full arrays into LAMBDA in Excel, letting you compute percent shares fast and explain results clearly.

Tonica Tatum-Gormes leads her students through a math problem involving a money-saving strategy, Sept. 12, 2023. She teaches a course called Advanced Algebra with Financial Applications at Capital ...

The latest results from the National Assessment of Educational Progress just painted a dismal picture of math performance in America’s schools, continuing to show more than a decade of stagnation.

Across the country, educators continue to wrestle with big questions about math curricula. Two years ago, the California education board’s adoption of a long-gestating new math framework added more ...