I. A 4th grade (TERC) Investigations homework sheet, handed out in mid-November (Unit 3, Section 4.1, p. 52) [click on picture to enlarge]:
II. From an earlier point in the 4th grade Singapore Math curriculum (Primary Mathematics 4A, p. 54) [click on picture to enlarge]:
III. Extra Credit
1. Compare the mathematical and logical demands of the two problem sets.
2. How do the different roles of logical reasoning vs. visual representation parallel what we see in Reform vs. traditional geometry?