A List of the Problems of the Month (2007 - 2015)

Here is a list of all the Problems of the Month that have been posted from January 2007 through December 2015.   You may view any of the past problems by clicking on the name.

2007

Date	Name of Problem of the Month	Math Needed
January 2007	Mr P's Life	Algebra
January 2007	Carrie the Camel	Arithmetic
February 2007	How Many Squares?	Geometry
February 2007	How Fast Must I Go?	Algebra
February 2007	How Much Homework?	Algebra
March 2007	SUDORKU	Calculus, Algebra, Geometry
March 2007	Fill in the Blanks	Geometry, Arithmetic
March 2007	Change for your Dollar	Arithmetic
April 2007	Mathematician's Puzzle	Logic
April 2007	Coin Flipping Game	Probability
April 2007	Sports Math	Arithmetic, Algebra
May 2007	The Basement Problem	Geometry
May 2007	High Schools in Fort Collins	Algebra (Pascal's Triangle)
June 2007	My Mistake	Logic
July 2007	Manhattan & the Indians	Algebra
August 2007	Interstate Highway Trip	Logic
September 2007	Famous Addresses	None
September 2007	Leftovers Again?	Number Theory
September 2007	Runner's Rate	Algebra
October 2007	Allowance Problem	Arithmetic, Logic
October 2007	Scrabble Comic	Arithmetic, Logic
October 2007	Pumpkin Maze	Logic
November 2007	Airport Problem	Geometry, Logic
November 2007	Walking Problem	Algebra
November 2007	Sum Problem	Arithmetic, Logic
December 2007	Christmas Square Dance	Algebra (Squares)
December 2007	Magic Square	Algebra
December 2007	Train Message	Algebra

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2008

Date	Name of Problem of the Month	Math Needed
January 2008	Paper Problem	Logic, Geometry
January 2008	Mathematical Wackie Wordies	Logic
January 2008	Harry Potter Problem	Denominate Numbers
February 2008	Phone Number Problem	Algebra
February 2008	Phone Button Boggle	None
February 2008	MaxMin Problem	Number Theory
March 2008	Tip Problem	Algebra
March 2008	4 Questions Problem	Algebra
March 2008	Aces and Faces Problem	Logic
April 2008	CiCi Pizza Problem	Algebra
April 2008	15% Tip Problem	Algebra
April 2008	Deathly Hallows Problem	Geometry
May 2008	Apple Blossom Problem	Geometry
May 2008	In the Land of the Truth-tellers and Liars	Logic
June 2008	Coin Problem	Algebra
July 2008	The Bike Problem	Percents
August 2008	The Candle Problem	Algebra
September 2008	Personal Telephone Numbers	Algebra
September 2008	Star Sum	Algebra
September 2008	Gas Problem	Arithmetic
October 2008	Square Sums	Algebra
October 2008	Centennial Problem	Geometry
October 2008	Biggest Number Problem	Arithmetic
November 2008	Area Problem	Geometry
November 2008	Election Day Cryptarithm	Arithmetic
November 2008	In the Cards	Logic
December 2008	Addition Trick	Logic, Algebra
December 2008	Candy Canes and Ornaments	Logic

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2009

Date	Name of Problem of the Month	Math Needed
January 2009	Dorm Problem	Logic, Number Theory
January 2009	Marriage Problem	Logic, Algebra
January 2009	Hand Bell Problem	Logic
February 2009	Likes / Dislikes Problem	Logic
February 2009	Lunch Hour Problem	Arithmetic
February 2009	Painting Problem	Algebra
March 2009	Harry Potter Cryptarithm	Algebra
March 2009	Mr. P's Social Security Problem	Algebra
March 2009	College Math	Algebra
April 2009	Letter Problem	Logic, Patterns
April 2009	Three Stop Metro Maze	Logic
April 2009	KenDoku	Addition, Logic
May 2009	Missing Number Problem	Algebra
May 2009	Dragon Problem	Logic
May 2009	Checkerboard Problem	Logic
June 2009	Exceptional Numbers	Logic
June 2009	Hockey Problem	Logic
July 2009	Estate Problem	Percent, Algebra
August 2009	Belly Dancer Problem	Algebra
September 2009	Blip, Blop, Bleep Problem	Logic
September 2009	Cross Number Puzzle	Logic, Number Properties
September 2009	Random Walk	Probability
October 2009	Doodle Code	Logic, Algebra Properties
October 2009	Circular Reasoning	Logic
October 2009	Counting Triangles	Geometry, Logic
November 2009	Tax Problem	Algebra
November 2009	Sudominoku	Logic
November 2009	Word Ladders	Logic and Vocabulary
December 2009	Holiday Greeting	Algebra
December 2009	Numbers and Operations	Algebra
December 2009	Sequence Problem	Algebra

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2010

Date	Name of Problem of the Month	Math Needed
January 2010	HDTV Problem	Geometry, Algebra
January 2010	Sales Problem	Algebra
January 2010	Gatecrasher Problem	Statistics, Logic
February 2010	MPH Problem #1	Arithmetic, Algebra
February 2010	MPH Problem #2	Algebra
February 2010	National Parks Tour	Logic
March 2010	Prius Problem #1	Algebra
March 2010	Prius Problem #2	Algebra
March 2010	Prius Problem #3	Algebra
April 2010	Age Problem	Arithmetic
April 2010	Applebee's Trios Problem	Probability
April 2010	Number Trivia	Arithmetic, Magic Squares
May 2010	Game of Fifty	Arithmetic, Logic
May 2010	Four By Four	Algebra
June 2010	Wal Mart Ad	Arithmetic, Logic
July 2010	Bridge Problem	Logic
August 2010	Math Facts	Facts
August 2010	Heat Index	Algebra, Matrices
September 2010	Humidifier Problem	Algebra
September 2010	Crossword Sudoku	Logic
September 2010	Mr. P's Life	Algebra, Logic
October 2010	Clock Problem	Algebra
October 2010	Scrabble Problem	Geometry, Logic
October 2010	Going to St. Ives	Logic
November 2010	Japanese License Plates	Probabilty, Logic
November 2010	True or False?	Logic
November 2010	IRA RMD Problem	Algebra
December 2010	Double Sixes	Probabilty
December 2010	Pedometer Problem	Algebra
December 2010	Whiskeytown Lake Problem	Algebra, Geometry

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2011

Date	Name of Problem of the Month	Math Needed
January 2011	Crater Lake Problem	Geometry, Algebra
January 2011	Counting Carbs	Algebra
January 2011	Letters in a Square	Logic
February 2011	Tuition Increase	Algebra
February 2011	2011 Prime Problem	Algebra
February 2011	Push Up Problem	Algebra
March 2011	Addition Problem	Algebra
March 2011	Carton Problem	Algebra
March 2011	Push Up Problem -- Part Two	Algebra
April 2011	Digit Problem	Algebra
April 2011	Construction Problem	Algebra
April 2011	Book Problem	Logic
May 2011	Pond Problem	Algebra, Geometry
May 2011	Sequence Problem	Logic
May 2011	Lyin' Lonnie	Logic
June 2011	Sum Triangle Problem	Logic, Algebra
June 2011	Jackson's Age	Algebra
June 2011	Mother & Daughter Problem	Algebra
July 2011	Safe Deposit Box Problem	Algebra
July 2011	Age Problem	Algebra
July 2011	Sequence Problem	Algebra
August 2011	Hiking Problem	Algebra
August 2011	Money Problem	Algebra
August 2011	Sonic Ad Problem	Probability
September 2011	How Many Games?	Logic, Primes
September 2011	CalcuDoku	Logic
September 2011	Pencil Problem	Algebra
October 2011	The Math Path	Logic
October 2011	The Math Square	Geometry
October 2011	The Bug Problem	Algebra
November 2011	Set the Clock Back!	Logic
November 2011	11/11/11 Problem	Algebra
November 2011	Ranked Voting Problem	Algebra, Logic
December 2011	Birthday Problem	Logic
December 2011	Romeo and Juliet	Arithmetic
December 2011	Good bye to 2011	Algebra

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2012

Date	Name of Problem of the Month	Math Needed
January 2012	Credit Card Rewards Problem	Algebra
January 2012	Upside Down Problem	Algebra
January 2012	What Time Is It?	Geometry
February 2012	Money Problem	Logic
February 2012	Cross Math Problem	Algebra
February 2012	Armadillo Restaurant Problem	Algebra
March 2012	Divide and Conquer	Algebra, Divisibilty
March 2012	Squares Away	Arithmetic
March 2012	Mazematics	Arithmetic and logic
April 2012	Sum Problem	Arithmetic and logic
April 2012	Ultra-High Definition TV Problem	Geometry
April 2012	Box Problem	Logic
May 2012	Number Mazes	Arithmetic and logic
May 2012	Geometry Cross Sum	Arithmetic and logic
May 2012	The Puzzled Driver	Logic, Algebra
June 2012	The Lady and the Tiger	Arithmetic, Geometry
July 2012	Trains Meeting	Algebra
July 2012	Round Table	Logic
July 2012	Change the Equation	Algebra, Logic
August 2012	Count the Triangles	Arithmetic, Geometry
August 2012	Hardware Problem	Algebra
August 2012	Clock Problem	Algebra
September 2012	From Fort Collins to Rock Springs	Algebra
September 2012	Matching Socks	Probability
September 2012	Mulch Problem	Logic, Arithmetic
October 2012	MONSTER COSTUME PARTY	Logic
October 2012	Area Problem	Geometry
October 2012	Tipping Problem	Algebra
November 2012	Answering Machine Problem	Arithmetic
November 2012	Restaurant Problem	Logic
November 2012	Mr. P's age	Logic, Arithmetic
December 2012	Tree Trimming Problem	Logic
December 2012	Decode the Message	Algebra, Trig, Calculus
December 2012	Reindeer and Sleighs	Logic

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2013

Date	Name of Problem of the Month	Math Needed
January 2013	The New Year Challenge	Algebra
January 2013	Elvis, The King of Rock N Roll	Logic, Arithmetic
January 2013	On The Level	Logic, Algebra
February 2013	Equation Sudoku	Arithmetic, Logic
February 2013	Ski Boot Sale	Logic
February 2013	Homework Problem	Arithmetic
March 2013	Wordoku	Logic
March 2013	Coin Problem	Arithmetic, Logic
March 2013	Rectangle Problem	Geometry
April 2013	Tangent Circles	Geometry
April 2013	Whale of a Tail	Algebra
April 2013	Fraction Problem	Arithmetic
May 2013	Three Circle Problem	Geometry
May 2013	Mr. P's Garden	Trigonometry
May 2013	Sum-Thing Missing	Algebra, Logic
June 2013	Archery Problem	Arithmetic
June 2013	Addition Problem	Arithmetic, Logic
June 2013	Powerful Discovery Problem	Arithmetic, Logic
July 2013	Have Sum Fun	Logic, Arithmetic
July 2013	Square Deal	Logic, Arithmetic
July 2013	Internet Problem	Logic
August 2013	Sleepless in Fort Collins	Arithmetic, Logic
August 2013	Try Angles	Geometry, Logic
August 2013	Texting While Driving	Algebra
September 2013	Best Chocolate Chip Cookie	Logic
September 2013	Computer Passwords	Probability & Statistics
September 2013	Tipping Problem	Arithmetic, Logic
October 2013	Clueless Crossword	Logic
October 2013	Jackpot Yahtzee	Probability & Statistics
October 2013	Incline Railway	Geoometry or Trigonometry
November 2013	KenKen Puzzle	Logic, Arithmetic
November 2013	Birthday Problem	Probability
November 2013	Wheel of Math	Logic
December 2013	Birthday Problem Revisited	Probability
December 2013	Circle / Triangle Problem	Geometry
December 2013	The Game of Kayles	Logic

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2014

Date	Name of Problem of the Month	Math Needed
January 2014	The New Year Challenge	Algebra
January 2014	Cross Out	Arithmetic, Logic
January 2014	National Park Road Kill	Arithmetic, Algebra
February 2014	Hobo Problem	Algebra
February 2014	Contracting Costs	Algebra
February 2014	Tipping Problem	Algebra
March 2014	Travel Problem	Algebra
March 2014	Inferno	Algebra
March 2014	Trivia Magic Square	Algebra, Geometry
April 2014	Poker Squares	Logic
April 2014	State Capitals Tour	Logic
April 2014	Algebra Limericks	Algebra
May 2014	Jack and Jill	Algebra
May 2014	Metroville	Logic
May 2014	Checkerboard Problem	Logic, Patterns
May 2014	Handley High Adventure ($100 prize)	Logic
June 2014	Odd Day Problem	Arithmetic
June 2014	CSU Basketball Problem	Arithmetic
June 2014	Euclid's Problem	Algebra
July 2014	Billion Dollar Money Problem	Arithmetic
July 2014	Strange Game	Arithmetic, Logic
July 2014	Brick by Brick	Geometry, Logic
August 2014	Special Numbers Problem	Arithmetic, Logic
August 2014	99 Bottles of Beer	Arithmetic, Logic
August 2014	Baseball Problem	Logic
September 2014	A Madam Problem	Logic
September 2014	Football Attendance Problem	Algebra
September 2014	Chess Problem	Algebra
September 2014	States Trivia Game	Logic
October 2014	Balance Quest	Algebra, Logic
October 2014	Square Abouts	Logic
October 2014	Flipping Pancakes	Logic
November 2014	Rhyme Time	Logic
November 2014	Ice Explorer Problem	Logic
November 2014	Calgary Tower Problem	Logic
December 2014	Christmas Tree Problem	Logic, geometry
December 2014	Prime Interest	Logic, Primes
December 2014	Coke Zero Problem	Arithmetic

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2015

Date	Name of Problem of the Month	Math Needed
January 2015	The New Year Challenge	Algebra
January 2015	Markdowns or Freebies?	Arithmetic
January 2015	Trial Separation	Logic, Geometry
February 2015	Valentine's Message	Arithmetic
February 2015	Clock Problem	Geometry, Logic
February 2015	HDTV Problem	Geometry, Algebra
March 2015	Easy As 1, 2, 3 ...	Arithmetic, Logic
March 2015	Celebrity & Real People Salaries	Arithmetic
March 2015	A Square Deal	Arithmetic, Logic
April 2015	Coke Zero Part 2	Arithmetic
April 2015	Math Maze	Arithmetic, Logic
April 2015	The Wheel Thing	Algebra
May 2015	Number Play	Arithmetic, Algebra
May 2015	ISBN Problem	Arithmetic
May 2015	Easy as A,B,C	Arithmetic
June 2015	Anniversary Message	Arithmetic, Logic
June 2015	Sum-Thing Missing	Arithmetic, Logic
June 2015	The Wading Pool	Arithmetic, Logic
July 2015	Parking Lot Problem	Logic
July 2015	Pipe Problem	Logic
July 2015	Circle Problem	Logic
August 2015	Widget Digits	Arithmetic, Logic
August 2015	Shapes Puzzle	Logic
August 2015	Tic Tac Toe Triple Play	Logic
September 2015	What's A Name In?	Logic
September 2015	Card Trick	Arithmetic, Logic
September 2015	Mr. P's Grandchildren	Logic
October 2015	Birthday Problem	Logic
October 2015	Word Worms	Logic
October 2015	SPOT IT!	Logic
November 2015	Mathematical Road Trip	Logic
November 2015	Small Change	Logic
November 2015	Odd Letter Out	Logic
December 2015	A Number and its Reciprocal	Algebra
December 2015	Mr. P in the Prime of his Life	Algebra
December 2015	Logical Sequences	Algebra

Send any comments or questions to: David Pleacher