9 core topics + 3 prerequisite topics taught as needed · approximately 2 hours of instruction including spaced review
An adaptive diagnostic (up to 40 questions) places the student on the course's knowledge graph — topics already known are credited, and instruction begins exactly at the learning frontier. Every topic is taught with a worked-example lesson and auto-graded practice; a topic is mastered at 75%+ and then maintained through spaced reviews on an expanding schedule. A cumulative quiz follows every 6 lessons. Prerequisite gaps below the course are detected and taught rather than skipped, so completion certifies the whole tower, not just the top.
| Counting Pictures & Objects [E] | Careful counting beats fast counting. |
| Hops on the Number Line [E] | Equal jumps are hidden multiplication. |
| What Comes Next? [E] | Find the rule, then trust it. |
| Missing-Number Puzzles [E] | Undo the operation to find the hidden number. |
| Fair Sharing [E] | Division with (and without) leftovers. |
| Days & Calendars [E] | Weeks repeat in sevens. |
| Sides & Corners [E] | Shapes hide multiplication; cuts make one more piece. |
| Coins & Small Money [E] | Count money in groups; go greedy for fewest coins. |
| Little Logic Puzzles [E] | Chain the clues in order. |
| Adding & Subtracting Whole Numbers | Multi-digit addition and subtraction. |
| Multiplication | Multiplying whole numbers. |
| Division | Dividing whole numbers. |