Squares Level 18: 3d square H:7-9 U:7-9. multiplication window train. 1. Left Edge789 squared equals 789 times itself1. Left EdgeUse the highlighted left edge pair.789times7897x7492 pairs3 pairs2 pairs9x9Active multiplication train windowraw windowsraw -> 49 | _ | _ | _ | _Use the highlighted left edge pair. Carry waits for settle.2. Left Cross2. Left CrossAdd both highlighted pairs.789times7897x7492 pairs1123 pairs2 pairs9x9Active multiplication train windowraw windowsraw -> 49 | 112 | _ | _ | _Add both highlighted pairs. Carry waits for settle.3. Center Stack3. Center StackAdd all 3 highlighted pairs.789times7897x7492 pairs1123 pairs1902 pairs9x9Active multiplication train windowraw windowsraw -> 49 | 112 | 190 | _ | _Add all 3 highlighted pairs. Carry waits for settle.4. Right Cross4. Right CrossAdd both highlighted pairs.789times7897x7492 pairs1123 pairs1902 pairs1449x9Active multiplication train windowraw windowsraw -> 49 | 112 | 190 | 144 | _Add both highlighted pairs. Carry waits for settle.5. Right Edge5. Right EdgeUse the highlighted right edge pair.789times7897x7492 pairs1123 pairs1902 pairs1449x981Active multiplication train windowraw windowsraw -> 49 | 112 | 190 | 144 | 81Use the highlighted right edge pair. Carry waits for settle.6. Settle strip6. Settle stripSettle once.Keep ones; carry moves left.raw windows49 | 112 | 190 | 144 | 81settled strip62 | 2 | 5 | 2 | 1Final multiplication answer49 | 112 | 190 | 144 | 81 -> 622521.