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By Stella Number

1000.11 Spirals
1000.12 Looping Paths
1000.14 Knots
1000.15 Mirror Clocks, Part 1
1000.16 Mirror Clocks, Part 2
1000.21 Floor Tile Reflection 1
1000.22 Floor Tile Reflection 2
1000.23 Floor Tile Reflection 3
1000.26 Nasty Book Page Fold
1000.31 Tent Among Four Trees
1000.41 Non-Intersecting Paths on Grid
1000.45 Line Fragments 1
1000.46 Line Fragments 2
1000.47 Line Fragments 3
1000.53 Goldfish Pond
1000.54 Canoe Swapping Places
1000.55 Bagpipers
1000.56 Yearbooks
1000.61 Poison Pills
1000.65 Alphabet Line 1
1000.72 Clock Hands Overlap
1000.75 Scott the Painter
1000.76 Broken Line Proof
1000.81 Pattern Continuation
1000.82 Pattern Continuation (Acropolis)
1000.91 Domino Chessboard
1000.92 Classroom Chairs
1000.93 Queens on a Chessboard
1007.11 Trace Path Through House
1007.21 Trace Ellipse Network
1010.41 Square Sequences 1 (3 x 3)
1010.42 Square Sequences 2 (3 x 3)
1020.12 Covered Shapes
1020.42 Overlapping Squares
1020.51 Manhole Covers
1027.11 Partition Shape 1 (Berloquin)
1027.44 Gardens, Congruent
1030.11 Nine Dots
1040.11 Ten Peach Trees
1040.21 Nine Cherry Trees
1040.31 Moving Circles
1050.11 Triangle of Pennies
1050.61 Rolling Penny
1060.11 Toothpicks: 6 Squares to 4 Squares
1060.41 Toothpicks: 5 Squares to 4 Squares
1070.11 Limerick
1070.12 This Man's Father
1070.13 Snail in a Well
1070.14 Pencil and Notebook
1070.15 Pirate Queen
1070.16 Log Saw (Woodie Lott)
1070.18 Spend All But $3.00
1070.19 Watson's Purchase
1070.31 7 and 11 Become Even
1070.33 Fathers and Sons
1079.11 Crabcake
1080.12 Spiral Illusion
1090.21 Cube Vertices, Numbered
1090.22 Cube Frame, Vertices Numbered
1090.26 Cake Cutting
1090.31 Mixed Sticks
1090.33 Cube Pattern
1090.34 Cube View 1
1090.35 Cube View 2
1090.36 Cube View 3
1090.41 Rectangle, Make Boxes
1090.42 Toothpicks: 6 Make 4 Triangles
1090.71 Blue Cube, 27 Little Cubes
1090.72 Cube, Orange, Cut Up
1090.73 Cube With 6 Cuts
1090.74 Cube, Yellow
1100.11 Wooden Disc
1100.22 Quasi-Pascal Triangle
1100.51 Agatha the Cow
1100.71 Grocer's Scales (Martha)
1110.41 Digit Cells
1110.61 Security Guards
1120.11 Crossnumber Puzzle 1
1130.11 Magic Square with Primes
1140.11 Two Pails
1140.14 Dividing Soda (24; 5, 11, 13)
1160.11 Send More Money
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
1180.21 Missing Dollar
1180.22 Horse Trading
1180.23 Tony's Hat
1180.32 Commuting, Bus and Train
1180.35 Mothers & Daughters Shopping
1180.36 Hospital Staff (Doctors, Nurses)
1180.37 Dogs, Cats, Snakes
1180.41 Sherman & Cyrus
1180.43 Gleepers & Blahmies
1180.45 Zetters & Zuffers
1180.61 Brothers and Sisters
1180.62 Robins Here and There
1180.65 Tennis Tournament
1180.66 The Problem Before... After...
1180.81 Horse Race (Bedouin)
1180.83 Vanilla Yogurt
1180.85 Four Errors
1190.31 Charlie & LaQuanda
1190.33 Old Watches
1190.34 Kant's Clock, Neighbor
1190.51 Bonkers Calendar
1190.52 Day Before Yesterday
1210.21 Cheerleaders' Three Hats
1220.11 Five Houses, Lemonade, Camel
1230.11 Gunny Sacks
1230.21 The Cook, the Baker, and the Miller
1230.32 Messrs. Blue, White, Gray
1230.33 Athletes
1230.34 Super Duper Market
1230.36 Tennis Playing Family
1230.41 Card Players Around a Table
1230.44 Glenda Quiz
1230.47 Ant, Bat, Cat
1230.51 Playing Cards Arrangement
1230.52 Spirit Week Bake Sale Booth
1230.61 Main Street Houses, Liars
1230.63 Video Games, One Statement True
1230.71 Chemistry Puzzle
1232.11 Soccer Game Scores 1
1232.31 Burglary Witnesses
1250.11 False Coins 1
1250.12 False Coins 2 (9, Heavy, 2)
1250.13 False Coins 3 (9, ?, 3)
1255.11 Scales
1260.01 Handshakes (24, 1)
1260.02 Handshakes (n, 1)
1260.21 Handshakes, Fly on the Wall (36)
1270.11 Pigeonhole Principle (Original)
1270.13 Globs/Glitches
1280.11 Highland Island 1 (C, P)
1280.12 Highland Island 2 (C, P)
1280.21 Spying on Student Council
1290.14 Gym Class
1300.11 Guess the Number
1307.11 Consecutive Integers, Sum of 17798
1307.31 Consecutive Integers, Sum of 100
1310.11 Evens Minus Odds
1310.25 Super-Venn (Sums in Circles)
1310.32 Lookout Tower
1310.41 Target
1320.11 Digits in Product
1322.11 Remainder When Dividing by 13
1340.41 Paths to LOVE
1340.42 Paths to MISERABLE
1365.11 Decimals on Calculator Screen
1368.21 Sum of Big Fractions
1368.25 Egyptian Fractions
1370.11 Percent Gain and Loss
1370.21 Percent Calculation
1380.11 Sum, Sum of Squares
1380.31 Negative Number Products
1395.21 Radical in Radical
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
1490.21 Prom Band
1490.31 Tie-Dyed T-Shirts
1510.11 Heap, Egyptian Equation
1510.21 Pamela Gore
1510.22 Man's Long Life
1510.41 Alex Watt's Will (Scotland)
1510.42 Farmer Fox Herd of Cows
1510.51 Stella's Bookshelves
1510.52 Totem Pole
1530.31 Jellybeans
1530.33 Maumee Limerick
1540.21 Golden Oldies
1540.33 Hattie's Age in 1900
1540.34 Aggie's Eggs
1540.35 Apples on Hike
1540.36 Bread on Hike
1540.37 Minnie Spends 2/3 of Money
1540.41 Brine Tank
1540.51 Gas Bill Printing
1540.61 Tape Sale
1550.11 Shelley, Veronica, Christy, and Ruth
1550.12 Mike, Ron, Debra, and Susie
1550.14 Toy Rocket
1550.15 Rooster, Goose, Duck Prices
1550.16 Horses and Harness
1550.18 Jacob's Bumper
1550.19 The Scale
1550.21 Scooters and Tricycles
1550.22 Dogs and Ducks
1550.24 Sibyl Dibble
1550.25 Tree and Pole
1550.26 Brick on 2-Pan Scale
1550.29 Restaurant Bill
1550.31 Rick's Bed
1550.32 Eggs to Carry
1550.33 Apollo Ticket Prices
1550.35 Sandwiches
1550.36 Splitting Up 64
1550.42 Sheriff Election
1550.43 Horse, Mule, Golden Trinkets
1560.11 Pickanumba, Result is 2
1560.21 Pickanumba, Give Digits
1610.11 One Million
1610.12 Primes in Product
1610.31 Nasty Numbers
1640.31 Ball-Point Pens on Sale
1650.12 Marble Piles
1650.13 Chinese Restaurant Party
1650.21 Dorothy Eggs
1650.31 Divisibility Theorem (Sum)
1720.11 Product = TTT
1730.41 All the Money You Need
2020.11 Powers of n + i
2050.21 Four 4's: 1 - 20
2050.22 Four 4's: 21 - 40
2050.41 Six 9's Make 100
2070.12 Formula for Oranges
2070.13 Kumquats
2070.21 Mrs. McGillicuddy's Age
2070.51 Calendar Square of Dates: Formula
2070.61 Plywood, Circular Holes
2070.71 Next Perfect Square
2070.82 Formula: Recursive to Closed
2070.84 Particle Moving
2100.21 x^y = y^x
2100.52 Rational Expressions, Laws of Exponents
2110.12 Giant Distributive Law = 0
2110.31 Product + 1
2110.34 If x + y + z = 1, then ...
2122.11 Cubic Factoring
2140.11 Triple Ratio
2140.21 Beakers, Ratio of Acid to Water
2150.11 Difference of Reciprocals
2150.21 Opposite Reciprocals
2150.22 Reciprocal Equation
2150.42 Fraction Equals c/d
2152.21 Maximize Fraction, Bank Robber
2162.11 Continued Fraction with 1's and 3's
2180.11 Radical Has Real Values
2200.11 Number of Positive Integer Solutions
2200.21 Equation with Fractions
2210.11 Fraction Inequality
2210.21 Inequality
2210.32 Inequality with Fractions
2210.41 Inequality as Distance
2210.51 Inequalities, Several
2210.71 Points on Line Making Triangle
2210.81 Inequality with Radicals
2211.11 Inequality with 2 Absolute Values
2211.21 Product with Absolute Value
2220.11 Timbuktu Post Office
2230.11 Quadratic to Multiply & Factor
2230.22 Golden Ratio
2230.51 Jessamine Bush
2230.63 Quadratic, Difference of Roots is 1
2230.81 Cat Burglar, Crate
2232.11 Progression to Quadratic
2250.11 Rational Equation, Nice
2260.11 Giant Difference of Squares
2260.21 Factor Fourth Degree Equation
2260.41 Two Cubes, Volume = Edges
2288.11 Quadratic Leading to x = y = z
2290.21 Ratio with Two Variables
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
2410.12 Audio Equipment
2410.13 Bertha's Tax
2410.23 Foul Shots
2410.33 Rectangle Increase
2410.34 Wendy the Chemist
2410.42 Pompeii Geothermal Corp. Wages
2420.11 Hen and a Half
2420.12 Hen and a Half, Variables
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
2440.11 Beef Stroganoff
2440.12 Orthodontist
2440.13 Driving to Cleveland
2440.15 The Rocket Sled
2440.31 Columbus to Cincinnati
2440.32 Driving to Atlanta
2440.33 Driving to See Grandmother
2440.41 Yorkshire to London
2440.52 Speedboat
2440.62 Formula for Necessary Return Speed
2440.74 Fly Between Trains
2440.75 Reservoir Running
2440.76 Jetta vs. Corvette
2440.77 Harry the Hobo
2442.52 Daniel Boone, Plum Creek
2452.12 Doctors and Lawyers
2452.13 Fifty Members of Group
2452.14 Basketball Team Weight
2454.11 Arithmetic Mean & Geometric Mean
2460.11 Mike's Age
2460.28 Present and Future Ages 2
2460.29 Present and Future Ages 3
2460.81 Ages as Perfect Square
2465.21 Complicated Ages (Andrea, Bonnie)
2470.11 Backlot Books
2470.21 Barbells Sale
2470.41 Importing Truffles
2470.52 Fair Trade
2470.62 Solar Panel
2480.11 Birthday Present (Dimes, Quarters)
2480.51 Money Giving
2490.11 Supermarket, Apples
2490.21 Kite Strings
2490.32 Garden Crops
2500.11 Pet Rocks
2500.12 Stationery
2500.21 Triangle, Sides, and Perimeter
2500.31 Heads and Feet (Easy)
2500.41 Muffins
2500.61 Cows, Horses, Sheep in Pasture
2500.62 Newton's Cows
2500.63 Kumquat House Numbers
2500.71 Okla Homer Baggage
2500.81 Euler Fortune
2510.11 Defined Operations 1
2510.21 Defined Operations 2
2510.31 Defined Operation 2; 5 Parts
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
2530.52 Defined Operations 3; Do Composition
2530.73 Salary = f(n students)
2544.11 Function as Average
2580.11 Big f(x), Find f(6)
2580.21 Find f(x+1) - f(x)
2580.41 Find f(7) in 7th Power Equation
2580.51 Hard Functional Equation, f(n) = n
2580.61 Sequence Formula
2660.11 Simplify Complex Polynomial
2680.11 Cubic to Quadratic to Linear
2710.11 Giant Binomial Squared
2720.11 Minimize Sum of Distances
2760.21 Find Adjacent Corner of Square
2761.11 Sum of Slopes of Sides of Triangle
2761.12 Collinear Vertices of Squares
2761.13 Trapezoid Formed By Lines
2770.41 Circle & Triangle
2770.51 Moving Line
2784.11 Semi-Elliptical Arch
2850.21 Sit-Ups
2850.48 Six Sequences to Continue
2850.49 Unusual Sequence
2870.11 Basketball Bounces
2870.21 Geometric and Arithmetric Sequences
3050.12 Points on Line Segment
3070.11 Algebra with Angles
3070.12 Conjecture About Angles
3150.11 Calculating With Supplements
3155.21 Walking to Make Triangle
3155.41 Show Angle is 30°
3155.51 Width of Alley
3155.61 Find Lengths of Two Sides
3232.11 Find Altitude, Given Sides
3305.11 Diagonals of Two Regular Polygons
3310.11 Sum of Interior Angles
3320.11 Area Ratio, Circles and Square 1
3320.21 Perimeter Ratio, Squares
3350.11 Overlapping Parallelograms
3360.21 Rectangle Decomposed Into Squares
3405.12 Impossible Rectangle
3420.28 Squares, Shaded Area
3420.41 Split Parallelogram Area
3420.71 Hard Triangle Area in Square
3440.12 Billy the Goat
3440.31 Circular Lawn with Path
3440.43 Fences in Circular Region
3440.51 Seven Circles in Large One
3460.11 Line Splits Triangle Into Equal Areas
3470.12 Radio Antenna
3470.13 Clairbuoyant
3470.14 Interior Segments of Square
3470.21 Distance
3470.61 Barber Pole
3500.31 Circle Around 3 Squares
3500.41 Stack of Water Pipes
3500.51 Gertrude Goldfish
3500.71 Semicircles
3510.11 Identify the Shape
3530.11 Find Diameter of Circle
3550.21 Giant Clock, Bug Speed
3550.23 Spinning in Circles
3550.24 Clock Hands Overlap After Noon
3580.11 Trapezoid, Similar Triangles
3640.11 Sphere Packed in Box
3650.11 Peanut Butter Jar
3650.31 Volume Equals Surface Area
3650.41 Cylinders, Pouring Contents
3680.21 Grasshopper Jump
3750.13 Wind Farm
3750.21 Negation, Kmart Barbells
3750.31 Yaks, Blats, and Blobs
3750.41 True Statements on Card
3750.74 Tangalese People Non-Toxic
3850.11 Rhombi, Locus of Vertex
3850.12 Triangle Rotating in Square
3850.14 Crumbs on a Table
4040.11 Sin x = x/100
4050.11 Angles of a Triangle
4050.12 Tangent Circles, Area of Shaded Region
4140.11 Circumference
4200.21 Volcano
4200.23 The Lighthouse
4200.24 Rocket Launch
4220.21 Latitude of Flight
4220.22 Plane Speed = f(Latitude)
4220.41 Vertical Tower 1
4220.42 Vertical Tower 2