I. The most challenging division caculations in the 5th grade Investigations Student Activity Book (from the second-to-last chapter in the book) [click to enlarge]:
II. The most challenging division calcuations in the 5th grade Singapore Math Primary Mathematics Workbook (from the second chapter in the book) [click to enlarge]:
III. Extra Credit:
Which is a better preparation for 21st century algebra: the "division starter" method, or traditional long division?