Here's a basic chart showing what's where in this long list of problems. There are two fully detailed lists in the User Guide:  SDS Topics in Alphabetical Order and SDS Topics in Numerical Order.

TopicStella Number
Visual Problems1000 – 1170
Logical Deduction1180 – 1290, 3750
Arithmetic1300 – 2022
Symbol Manipulation2030 – 2390, 2745, 4100
Algebra Problems2400 – 2500
Analytic Geometry2750 – 2840, 3680 – 3723
Informal Geometry3000 – 3080
Euclidean Geometry3100 – 3650, 3750 – 3850
Trigonometry4000 – 4340
Probability4400 – 4420

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Stella NumberProblem Title
1100.51Agatha the Cow
1307.31Consecutive Integers, Sum of 100
1330.11Square Mistake!
1370.11Gain Versus Loss
1370.21Dust Mites
1380.31Find the falsehood
1410.12A Number Pattern
1490.21Prom Bands
1510.22Pebble's Long Life
1510.41Alex Watt's Will
1510.42Farmer Fox
1510.43Ftatateeta's Scarabs
1530.33I Have a Good Friend in Maumee
1530.35Mr. Eby's Spare Tire
1540.21Golden Oldies
1540.33Hattie's Age in 1900
1540.41Brine Tank
1540.51Electric Bill Printing
1550.11Shelley, Veronica, Christy, and Ruth
1550.12Malaz, Ron, Debra, and Sabrina
1550.14Toy Rocket
1550.15Rooster, Goose, Duck Prices
1550.16Harnessing Horses
1550.18Jacob's Bumper
1550.19Wrestlers on the Scale
1550.21Speeding Cycles
1550.22In A Dream
1550.23Batting Average no. 1
1550.24Sibyl Bibble
1550.25Tree and Nests
1550.29Restaurant Bill
1550.32Eggs to Carry
1550.39Trading Cards
1550.41Cows and Oxen
1550.43A Horse and a Mule Converse
1600.31Getting to Fort Wayne
1640.31Ballpoint Pen Sale
2050.44Parentheses Insert
2070.83Bowling Uphill
2420.11Hen and a Half
2452.13Fifty Mycologists
3650.13A Solid Cube of Bricks?
3650.21Two Barrels