# A Sample of Mathematical Puzzles - jrmf. A Sample of Mathematical Puzzles ... These abstract...

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The JRMF really gets it right. Usually the best parts of mathematics are kept away from

the public, as if you needed to be a mathematician to get to the fun stuff! Its refreshing to

see a festival that brings this stuff to light, and in such a relaxed atmosphere. If youre lucky

enough to have a JRMF near you, dont miss it! Its the best math party around.

Vi Hart, Mathemusician, youtube.com/user/ViHart

Book 1 (v2)

A Sample of Mathematical Puzzles

SquaringPuzzlesbyGordHamilton,MathPickle.com

SkyscrapersbyConceptisandPeterLiljedahl

TheJuliaRobinsonMathematicsFestivalreallygetsitright.Usuallythebestpartsofmathematicsarekeptawayfromthepublic,asifyouneededtobeamathematiciantogettothefunstuff!It'srefreshingtoseeafestivalthatbringsthisstufftolight,andinsucharelaxedatmosphere.Ifyou'reluckyenoughtohaveaJuliaRobinsonMathematicsFestivalnearyou,don'tmissit!It'sthebestmathpartyaround.

ViHart,RecreationalMathemusicianyoutube.com/user/ViHart

Imnotthatgoodinmathclass,butthisgotmeexcited.Itriedsomethingreallydifficult.Isawanadultstuckatthesameproblem.

LindseyGrade6

Ilikedworkingtogetherwithmyfriends.Theteacheratthetabledidnthelpusmuch.Wedidthisourselves.

ConnorGrade3

Ifyouareinterestedinvolunteering,organizingorhostingaFestival,emailusatinfo@jrmf.org.

CompiledbyNehaAluwalia,NeelSurya,MayaSissoko,andNancyBlachman

Julia Robinson(1919 - 1985)

Squaring Puzzles

Digit Sumswww.itsokaytobesmart.com

www.MathPickle.comSquareableNumbers

thesmartkitchenblog.comHugs & Kisses

TrapezoidalNumbers Switching Light Bulbs

Festival activities are designed to open doors to higher mathematics for students in grades K12. Visit www.JRMF.org for more information

about Julia Robinson Mathematics Festivals.

Compiled by Nancy Blachman, Founder, Julia Robinson Mathematics Festival.

1

Squareable Numbers by Daniel Finkel and Katherine Cook, Math for Love

The number n is squareable if it is possible to build a square out of n smaller squares (of any size) with no leftover space. The squares need not be the same size. For example, 1, 9, and 12 are all squareable, since those numbers of squares can fit together to form another square.

Is there a simple way to tell if a number is squareable or not?

Which numbers from 1 to 30 are squareable? Experiment. Every time you come up with a way to break a square into some number of squares, circle that number.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Is there a pattern? Can you predict squareability in general?

Heres why Dr. Finkel proposed this problem to Gary Antonick, who published it in the New York Time Numberplay online blog, wordplay.blogs.nytimes.com/2013/04/08/squareable .

I think this puzzle is amazing because its compelling right away, and you can work on it without worrying too much about wrong answers. If youre trying to show 19 is squareable and cant, maybe youll accidentally show 10 is squarable on the way. (Of course, neither of those numbers is necessarily squareable. No spoilers here.) Its great to be able to experiment with a puzzle in an environment where virtually everything you do gives you some positive gains. I also like it because the willy-nilly approach most people start with eventually leads to a more strategic approach, and it takes a combination of deeper strategies to solve the problem. I also like it because just about anyone can get started on it, and make some serious headway you dont need a sophisticated math background.

Find this and other Math for Love puzzles online at mathforlove.com/lesson-plan/ .

3

Hugs & Kisses

I hope you enjoy playing with the puzzles in this booklet. Please let us know your favorites and what you like about them. For more puzzles, visit the websites on the back cover of this booklet.

We invite you to attend or host your own mathematics festival. The last two pages of this booklet contain information about the Julia Robinson Mathematics Festival and how to organize one. Visit jrmf.org/find-a-festival/ for a list of upcoming Festivals. Email info@jrmf.org if you are interested in hosting your own Julia Robinson Mathematics Festival.

Nancy Blachman, Founded Julia Robinson Mathematics Festival in 2007

2

Squareable Numbers by Daniel Finkel and Katherine Cook, Math for Love

The number n is squareable if it is possible to build a square out of n smaller squares (of any size) with no leftover space. The squares need not be the same size. For example, 1, 9, and 12 are all squareable, since those numbers of squares can fit together to form another square.

Is there a simple way to tell if a number is squareable or not?

Which numbers from 1 to 30 are squareable? Experiment. Every time you come up with a way to break a square into some number of squares, circle that number.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Is there a pattern? Can you predict squareability in general?

Heres why Dr. Finkel proposed this problem to Gary Antonick, who published it in the New York Time Numberplay online blog, wordplay.blogs.nytimes.com/2013/04/08/squareable .

I think this puzzle is amazing because its compelling right away, and you can work on it without worrying too much about wrong answers. If youre trying to show 19 is squareable and cant, maybe youll accidentally show 10 is squarable on the way. (Of course, neither of those numbers is necessarily squareable. No spoilers here.) Its great to be able to experiment with a puzzle in an environment where virtually everything you do gives you some positive gains. I also like it because the willy-nilly approach most people start with eventually leads to a more strategic approach, and it takes a combination of deeper strategies to solve the problem. I also like it because just about anyone can get started on it, and make some serious headway you dont need a sophisticated math background.

Find this and other Math for Love puzzles online at mathforlove.com/lesson-plan/ .

3

Squareable Numbers

3

Squaring Puzzles

by Gord Hamilton, Math Pickle These abstract squaring puzzles give students addition and subtraction practice with numbers usually below 100. They also link these numerical activities to geometry. What a beautiful way to practice subtraction! Gord Hamilton, Founder of Math Pickle. The number in each square represents the length of a side of that square. Determine the length of a side of all the squares in this rectangle and the lengths of the sides of the rectangle.

Find more square and subtracting puzzles here: mathpickle.com/project/squaringthesquare/.

4

Heres a more challenging puzzle. As in the previous puzzle, the number in each square represents the length of the sides of that square. Determine the dimensions of all the squares in this rectangle and the lengths of the sides of the rectangle.

5

Squaring Puzzles

4

Squaring Puzzles

by Gord Hamilton, Math Pickle These abstract squaring puzzles give students addition and subtraction practice with numbers usually below 100. They also link these numerical activities to geometry. What a beautiful way to practice subtraction! Gord Hamilton, Founder of Math Pickle. The number in each square represents the length of a side of that square. Determine the length of a side of all the squares in this rectangle and the lengths of the sides of the rectangle.

Find more square and subtracting puzzles here: mathpickle.com/project/squaringthesquare/.

4

Heres a more challenging puzzle. As in the previous puzzle, the number in each square represents the length of the sides of that square. Determine the dimensions of all the squares in this rectangle and the lengths of the sides of the rectangle.

5

5

Algebra on Squares

by Gord Hamilton, Math Pickle mathpickle.com/project/algebraonrectangles

Imagine all the interior rectangles are squares. The letter in each square represents the length of a side of that square. Determine the length of a side of each square in this rectangle and write it inside the square. Also determine the lengths of the sides of the rectangle.

Find more of these algebra puzzles on the MathPickle link above.

If you want even more of a challenge, try the following puzzle.

7

Algebra on Squares

by Gord Hamilton, Math Pickle mathpickle.com/project/algebraonrectangles

Imagine all the interior rectangles are squares. The letter in each square represents the length of a side of that square. Determine the length of a side of each square in this rectangle and write it inside the square. Also determine the lengths of the sides of the rectangle.

Find more of these algebra puzzles on the MathPickle link above.

If you want even more of a challenge, try the following puzzle.

7

Algebra on Squares

6

Algebra on Squares

by Gord Hamilton, Math Pickle mathpickle.com/project/algebraonrectangles

Imagine all the interior rectangles are squares. The letter in each square represents the length of a side of that square. Determine the length of a side of each square in this rectangle and write it insi