1. Left Edge
7x9 = 63. Carry waits for settle.
4d x 4d (full range mastery)
6 visual steps / multi-digit window train
2. 2-Pair Window
2 pairs: 7x2 + 8x9 = 86. Carry waits for settle.
3. 3-Pair Window
3 pairs: 7x8 + 8x2 + 6x9 = 126. Carry waits for settle.
4. 4-Pair Center
4 pairs = 170. Carry waits for settle.
5. 3-Pair Right Window
3 pairs: 8x7 + 6x8 + 5x2 = 114. Carry waits for settle.
6. Settle strip
63 | 86 | 126 | 170 | 114 | 82 | 35 -> 73042255.
Practice Level 30
A few quick rounds make the train automatic; each raw window keeps one digit.
Start Level