Financial Math Puzzles

These fun, original puzzles can help sharpen your understanding of financial math. Some have been used in college finance courses.

I  learn valuable insights from your responses. For example, the shortcut formula I developed for Fast Formulas #3 was based on a very clever solution to Puzzle #3 by Ashwani Singh.

Puzzle #	Original Post	Follow-up Posts
1	Mortgage Average Life	Clue, Answer, Epilogue
2	Weighted Average LTV	Follow-up Questions, Answers to Follow-up Questions
3	Mortgage with Balloon	A Better Answer
4	Bond Pricing
5	A Royal Mystery	Leaping to Conclusions
6	Treasury Debt
7	The Mysterious Islands	Treasury Island, Part 1
8	James Bond*
9	Island of Games	Binary Sudoku and the Limits of Visualization, Melting Fractals
10	Erratic Bond Pricing?	A Hint, The Answer
11	A Pi Day Problem**	The Answer (Pi-Fingered Aliens)

*I admit that the James Bond puzzle has nothing to do with financial math. But it is Bond math.  James Bond math.

**Not really financial math either, unless the Pi-Fingered Aliens are actually floor traders with unique hand signals.