I. From the beginning of the "Special Rules" chapter (Chapter VI) of Wentworth's New School Algebra (published in 1898) [click to enlarge]:
II. The two problem sets within the entire Year 4 Interactive Mathematics Program that come closest to providing practice applying the Distribute Law to algebraic expressions [click to enlarge]:
III. Extra Credit:
There are no problems in the Year 4 Interactive Mathematics Program that involve demonstration or application of "Special Rules" in polynomial multiplication--Square of Sums, Square of Differences, Product of Sum and Difference. Is application of these "Special Rules" a 21st Century Skill?