According to teaching guides from Pearson and JICA , the "action" component refers to several active learning strategies: Dimensions Math Textbook 5A - Singapore Math

(and 5B) series is a powerhouse for building a rock-solid mathematical foundation.

When the PDF explains fraction multiplication with area models, pull up a free online fraction bar tool. The combination of static text (PDF) and dynamic visuals solidifies understanding.

: Measuring and finding unknown angles in various geometric figures.