By Course

Pre-Algebra

• 1000.12 Looping Paths
• 1000.46 Line Fragments 2
• 1000.61 Poison Pills
• 1000.72 Clock Hands Overlap
• 1007.21 Trace Ellipse Network
• 1060.11 Toothpicks: 6 Squares to 4 Squares
• 1060.41 Toothpicks: 5 Squares to 4 Squares
• 1070.13 Snail in a Well
• 1080.12 Spiral Illusion
• 1090.34 Cube View 1
• 1090.35 Cube View 2
• 1140.11 Two Pails
• 1160.31 Crypto-Product
• 1160.32 Crypt-Prod: Digits Used Once 1
• 1170.21 Dimes and Pennies
• 1170.42 Can't Change a Dollar Bill
• 1170.91 Path of Quarters
• 1170.92 Ton of Pennies
• 1170.93 Weight of $1000 in Dimes
• 1170.94 Total Growth
• 1180.22 Horse Trading
• 1180.35 Mothers & Daughters Shopping
• 1180.62 Robins Here and There
• 1220.11 Five Houses, Lemonade, Camel
• 1230.11 Gunny Sacks
• 1230.32 Messrs. Blue, White, Gray
• 1230.34 Super Duper Market
• 1230.51 Playing Cards Arrangement
• 1230.52 Spirit Week Bake Sale Booth
• 1260.01 Handshakes (24, 1)
• 1260.02 Handshakes (n, 1)
• 1270.11 Pigeonhole Principle (Original)
• 1300.11 Guess the Number
• 1307.31 Consecutive Integers, Sum of 100
• 1310.11 Evens Minus Odds
• 1310.32 Lookout Tower
• 1310.41 Target
• 1368.25 Egyptian Fractions
• 1370.11 Percent Gain and Loss
• 1410.11 Digits in Number in Exponential Form
• 1460.21 Estimate Products
• 1470.12 Newspaper Tearing & Stacking
• 1470.41 Giant Sum
• 1470.51 Heartbeats per Month
• 1470.52 Comparative Heartbeats Per Year
• 1470.53 Dripping Faucet
• 1480.11 Repeating Digits in Addition
• 1480.41 Broken Radical Key
• 1490.16 Sand Buying
• 1510.11 Heap, Egyptian Equation
• 1510.22 Man's Long Life
• 1510.41 Alex Watt's Will (Scotland)
• 1510.51 Stella's Bookshelves
• 1540.36 Bread on Hike
• 1540.51 Gas Bill Printing
• 1540.61 Tape Sale
• 1550.11 Shelley, Veronica, Christy, and Ruth
• 1550.15 Rooster, Goose, Duck Prices
• 1550.16 Horses and Harness
• 1550.19 The Scale
• 1550.21 Scooters and Tricycles
• 1550.29 Restaurant Bill
• 1550.32 Eggs to Carry
• 1650.12 Marble Piles
• 1650.13 Chinese Restaurant Party
• 1650.21 Dorothy Eggs
• 2452.14 Basketball Team Weight
• 2460.11 Mike's Age
• 2470.11 Backlot Books
• 2480.51 Money Giving
• 3650.11 Peanut Butter Jar

Algebra I

• 1000.11 Spirals
• 1000.31 Tent Among Four Trees
• 1000.41 Non-Intersecting Paths on Grid
• 1000.45 Line Fragments 1
• 1000.47 Line Fragments 3
• 1000.55 Bagpipers
• 1000.65 Alphabet Line 1
• 1000.93 Queens on a Chessboard
• 1010.41 Square Sequences 1 (3 x 3)
• 1027.44 Gardens, Congruent
• 1030.11 Nine Dots
• 1070.12 This Man's Father
• 1070.14 Pencil and Notebook
• 1070.15 Pirate Queen
• 1070.16 Log Saw (Woodie Lott)
• 1070.18 Spend All But $3.00
• 1070.31 7 and 11 Become Even
• 1090.33 Cube Pattern
• 1090.36 Cube View 3
• 1100.11 Wooden Disc
• 1100.22 Quasi-Pascal Triangle
• 1120.11 Crossnumber Puzzle 1
• 1140.14 Dividing Soda (24; 5, 11, 13)
• 1160.11 Send More Money
• 1180.32 Commuting, Bus and Train
• 1180.61 Brothers and Sisters
• 1180.66 The Problem Before... After...
• 1180.81 Horse Race (Bedouin)
• 1180.85 Four Errors
• 1230.21 The Cook, the Baker, and the Miller
• 1230.47 Ant, Bat, Cat
• 1232.11 Soccer Game Scores 1
• 1232.31 Burglary Witnesses
• 1255.11 Scales
• 1280.21 Spying on Student Council
• 1307.11 Consecutive Integers, Sum of 17798
• 1380.11 Sum, Sum of Squares
• 1380.31 Negative Number Products
• 1490.21 Prom Band
• 1530.33 Maumee Limerick
• 1540.21 Golden Oldies
• 1540.33 Hattie's Age in 1900
• 1540.41 Brine Tank
• 1550.12 Mike, Ron, Debra, and Susie
• 1550.14 Toy Rocket
• 1550.18 Jacob's Bumper
• 1550.26 Brick on 2-Pan Scale
• 1550.33 Apollo Ticket Prices
• 1550.42 Sheriff Election
• 1560.11 Pickanumba, Result is 2
• 1640.31 Ball-Point Pens on Sale
• 2070.13 Kumquats
• 2070.21 Mrs. McGillicuddy's Age
• 2070.51 Calendar Square of Dates: Formula
• 2070.61 Plywood, Circular Holes
• 2070.82 Formula: Recursive to Closed
• 2152.21 Maximize Fraction, Bank Robber
• 2410.12 Audio Equipment
• 2460.28 Present and Future Ages 2
• 2460.29 Present and Future Ages 3
• 2460.81 Ages as Perfect Square
• 2490.21 Kite Strings
• 2500.11 Pet Rocks
• 2500.41 Muffins
• 2530.11 Defined Operation; Find Formula
• 2530.31 Defined Operation; Do Inverse
• 2530.41 Defined Operations 1; Do Composition
• 2530.51 Defined Operations 2; Do Composition
• 2530.73 Salary = f(n students)

Geometry

• 1000.21 Floor Tile Reflection 1
• 1000.81 Pattern Continuation
• 1000.91 Domino Chessboard
• 1007.11 Trace Path Through House
• 1020.12 Covered Shapes
• 1020.42 Overlapping Squares
• 1020.51 Manhole Covers
• 1027.11 Partition Shape 1 (Berloquin)
• 1040.11 Ten Peach Trees
• 1070.19 Watson's Purchase
• 1090.21 Cube Vertices, Numbered
• 1090.41 Rectangle, Make Boxes
• 1090.42 Toothpicks: 6 Make 4 Triangles
• 1090.71 Blue Cube, 27 Little Cubes
• 1090.73 Cube With 6 Cuts
• 1090.74 Cube, Yellow
• 1100.51 Agatha the Cow
• 1100.71 Grocer's Scales (Martha)
• 1110.61 Security Guards
• 1130.11 Magic Square with Primes
• 1180.37 Dogs, Cats, Snakes
• 1180.43 Gleepers & Blahmies
• 1230.44 Glenda Quiz
• 1230.63 Video Games, One Statement True
• 1250.11 False Coins 1
• 1250.12 False Coins 2 (9, Heavy, 2)
• 1250.13 False Coins 3 (9, ?, 3)
• 1260.21 Handshakes, Fly on the Wall (36)
• 1290.14 Gym Class
• 1310.25 Super-Venn (Sums in Circles)
• 1340.41 Paths to LOVE
• 1340.42 Paths to MISERABLE
• 1370.21 Percent Calculation
• 1510.42 Farmer Fox Herd of Cows
• 1550.22 Dogs and Ducks
• 1550.24 Sibyl Dibble
• 1550.25 Tree and Pole
• 1550.43 Horse, Mule, Golden Trinkets
• 1650.31 Divisibility Theorem (Sum)
• 1730.41 All the Money You Need
• 2100.52 Rational Expressions, Laws of Exponents
• 2110.12 Giant Distributive Law = 0
• 2150.21 Opposite Reciprocals
• 2150.42 Fraction Equals c/d
• 2162.11 Continued Fraction with 1's and 3's
• 2210.71 Points on Line Making Triangle
• 2230.51 Jessamine Bush
• 2260.21 Factor Fourth Degree Equation
• 2290.21 Ratio with Two Variables
• 2440.11 Beef Stroganoff
• 2440.12 Orthodontist
• 2440.13 Driving to Cleveland
• 2440.31 Columbus to Cincinnati
• 2440.33 Driving to See Grandmother
• 2440.41 Yorkshire to London
• 2442.52 Daniel Boone, Plum Creek
• 2452.13 Fifty Members of Group
• 2500.21 Triangle, Sides, and Perimeter
• 2500.31 Heads and Feet (Easy)
• 2500.63 Kumquat House Numbers
• 2510.11 Defined Operations 1
• 2510.21 Defined Operations 2
• 2530.52 Defined Operations 3; Do Composition
• 2850.21 Sit-Ups
• 2870.11 Basketball Bounces
• 3050.12 Points on Line Segment
• 3070.11 Algebra with Angles
• 3070.12 Conjecture About Angles
• 3150.11 Calculating With Supplements
• 3320.21 Perimeter Ratio, Squares
• 3350.11 Overlapping Parallelograms
• 3405.12 Impossible Rectangle
• 3420.41 Split Parallelogram Area
• 3440.12 Billy the Goat
• 3440.31 Circular Lawn with Path
• 3440.51 Seven Circles in Large One
• 3470.14 Interior Segments of Square
• 3550.21 Giant Clock, Bug Speed
• 3650.31 Volume Equals Surface Area
• 3750.21 Negation, Kmart Barbells
• 3750.41 True Statements on Card
• 3750.74 Tangalese People Non-Toxic
• 3850.14 Crumbs on a Table

Algebra II / Trigonometry

• 1000.15 Mirror Clocks, Part 1
• 1000.22 Floor Tile Reflection 2
• 1000.26 Nasty Book Page Fold
• 1000.53 Goldfish Pond
• 1000.54 Canoe Swapping Places
• 1000.76 Broken Line Proof
• 1000.82 Pattern Continuation (Acropolis)
• 1040.21 Nine Cherry Trees
• 1050.11 Triangle of Pennies
• 1070.33 Fathers and Sons
• 1079.11 Crabcake
• 1090.22 Cube Frame, Vertices Numbered
• 1180.45 Zetters & Zuffers
• 1190.33 Old Watches
• 1230.41 Card Players Around a Table
• 1230.71 Chemistry Puzzle
• 1280.11 Highland Island 1 (C, P)
• 1280.12 Highland Island 2 (C, P)
• 1320.11 Digits in Product
• 1322.11 Remainder When Dividing by 13
• 1368.21 Sum of Big Fractions
• 1395.21 Radical in Radical
• 1490.31 Tie-Dyed T-Shirts
• 1510.21 Pamela Gore
• 1550.35 Sandwiches
• 1610.12 Primes in Product
• 1610.31 Nasty Numbers
• 2050.41 Six 9's Make 100
• 2070.71 Next Perfect Square
• 2070.84 Particle Moving
• 2100.21 x^y = y^x
• 2140.11 Triple Ratio
• 2140.21 Beakers, Ratio of Acid to Water
• 2150.11 Difference of Reciprocals
• 2150.22 Reciprocal Equation
• 2180.11 Radical Has Real Values
• 2200.11 Number of Positive Integer Solutions
• 2210.11 Fraction Inequality
• 2210.32 Inequality with Fractions
• 2210.51 Inequalities, Several
• 2210.81 Inequality with Radicals
• 2211.11 Inequality with 2 Absolute Values
• 2211.21 Product with Absolute Value
• 2220.11 Timbuktu Post Office
• 2230.22 Golden Ratio
• 2232.11 Progression to Quadratic
• 2260.11 Giant Difference of Squares
• 2288.11 Quadratic Leading to x = y = z
• 2300.11 Exponential Equation with 3's
• 2310.11 Farmers' Market, Chickens, Geese
• 2310.21 Coffee Break
• 2310.31 Intersecting Lines
• 2310.41 Parking
• 2410.11 Salesman's Commission
• 2410.13 Bertha's Tax
• 2410.34 Wendy the Chemist
• 2410.42 Pompeii Geothermal Corp. Wages
• 2420.11 Hen and a Half
• 2420.12 Hen and a Half, Variables
• 2440.32 Driving to Atlanta
• 2470.21 Barbells Sale
• 2470.41 Importing Truffles
• 2470.62 Solar Panel
• 2480.11 Birthday Present (Dimes, Quarters)
• 2490.11 Supermarket, Apples
• 2490.32 Garden Crops
• 2500.61 Cows, Horses, Sheep in Pasture
• 2500.71 Okla Homer Baggage
• 2510.31 Defined Operation 2; 5 Parts
• 2580.41 Find f(7) in 7th Power Equation
• 2710.11 Giant Binomial Squared
• 2760.21 Find Adjacent Corner of Square
• 2761.11 Sum of Slopes of Sides of Triangle
• 2761.12 Collinear Vertices of Squares
• 2770.41 Circle & Triangle
• 3155.41 Show Angle is 30°
• 3155.61 Find Lengths of Two Sides
• 3320.11 Area Ratio, Circles and Square 1
• 3360.21 Rectangle Decomposed Into Squares
• 3420.28 Squares, Shaded Area
• 3420.71 Hard Triangle Area in Square
• 3460.11 Line Splits Triangle Into Equal Areas
• 3470.12 Radio Antenna
• 3470.13 Clairbuoyant
• 3500.41 Stack of Water Pipes
• 3500.51 Gertrude Goldfish
• 3530.11 Find Diameter of Circle
• 3550.23 Spinning in Circles
• 3580.11 Trapezoid, Similar Triangles
• 3640.11 Sphere Packed in Box
• 3750.13 Wind Farm
• 3750.31 Yaks, Blats, and Blobs
• 3850.12 Triangle Rotating in Square
• 4050.12 Tangent Circles, Area of Shaded Region

Pre-Calculus

• 1000.14 Knots
• 1000.16 Mirror Clocks, Part 2
• 1000.23 Floor Tile Reflection 3
• 1000.56 Yearbooks
• 1000.92 Classroom Chairs
• 1010.42 Square Sequences 2 (3 x 3)
• 1040.31 Moving Circles
• 1050.61 Rolling Penny
• 1070.11 Limerick
• 1090.26 Cake Cutting
• 1090.31 Mixed Sticks
• 1090.72 Cube, Orange, Cut Up
• 1180.21 Missing Dollar
• 1180.36 Hospital Staff (Doctors, Nurses)
• 1190.34 Kant's Clock, Neighbor
• 1190.51 Bonkers Calendar
• 1190.52 Day Before Yesterday
• 1210.21 Cheerleaders' Three Hats
• 1230.33 Athletes
• 1230.36 Tennis Playing Family
• 1230.61 Main Street Houses, Liars
• 1270.13 Globs/Glitches
• 1365.11 Decimals on Calculator Screen
• 1510.52 Totem Pole
• 1540.35 Apples on Hike
• 1540.37 Minnie Spends 2/3 of Money
• 1550.36 Splitting Up 64
• 1720.11 Product = TTT
• 1560.21 Pickanumba, Give Digits
• 2020.11 Powers of n + i
• 2050.21 Four 4's: 1 - 20
• 2050.22 Four 4's: 21 - 40
• 2070.12 Formula for Oranges
• 2110.34 If x + y + z = 1, then ...
• 2122.11 Cubic Factoring
• 2200.21 Equation with Fractions
• 2210.21 Inequality
• 2210.41 Inequality as Distance
• 2230.11 Quadratic to Multiply & Factor
• 2230.63 Quadratic, Difference of Roots is 1
• 2230.81 Cat Burglar, Crate
• 2250.11 Rational Equation, Nice
• 2260.41 Two Cubes, Volume = Edges
• 2410.23 Foul Shots
• 2410.33 Rectangle Increase
• 2420.21 Horses and Oats, Numbers
• 2420.31 Plants to Water
• 2420.51 Glenice's Candles
• 2420.62 Brick Wall Without Picture
• 2430.11 Three Valves
• 2440.52 Speedboat
• 2440.62 Formula for Necessary Return Speed
• 2440.74 Fly Between Trains
• 2440.75 Reservoir Running
• 2440.77 Harry the Hobo
• 2452.12 Doctors and Lawyers
• 2454.11 Arithmetic Mean & Geometric Mean
• 2465.21 Complicated Ages (Andrea, Bonnie)
• 2470.52 Fair Trade
• 2500.12 Stationery
• 2544.11 Function as Average
• 2580.11 Big f(x), Find f(6)
• 2580.21 Find f(x+1) - f(x)
• 2580.51 Hard Functional Equation, f(n) = n
• 2580.61 Sequence Formula
• 2660.11 Simplify Complex Polynomial
• 2680.11 Cubic to Quadratic to Linear
• 2720.11 Minimize Sum of Distances
• 2761.13 Trapezoid Formed By Lines
• 2770.51 Moving Line
• 2784.11 Semi-Elliptical Arch
• 2850.48 Six Sequences to Continue
• 2850.49 Unusual Sequence
• 2870.21 Geometric and Arithmetric Sequences
• 3155.21 Walking to Make Triangle
• 3155.51 Width of Alley
• 3232.11 Find Altitude, Given Sides
• 3305.11 Diagonals of Two Regular Polygons
• 3310.11 Sum of Interior Angles
• 3440.43 Fences in Circular Region
• 3470.21 Distance
• 3470.61 Barber Pole
• 3500.31 Circle Around 3 Squares
• 3550.24 Clock Hands Overlap After Noon
• 3650.41 Cylinders, Pouring Contents
• 3680.21 Grasshopper Jump
• 3850.11 Rhombi, Locus of Vertex
• 4040.11 Sin x = x/100
• 4050.11 Angles of a Triangle
• 4140.11 Circumference
• 4200.21 Volcano
• 4200.24 Rocket Launch
• 4220.21 Latitude of Flight
• 4220.22 Plane Speed = f(Latitude)