Squares Level 19: 3d square H:7-9 (any). multiplication window train. 1. Left Edge739 squared equals 739 times itself1. Left EdgeUse the highlighted left edge pair.739times7397x7492 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.739times7397x7492 pairs423 pairs2 pairs9x9Active multiplication train windowraw windowsraw -> 49 | 42 | _ | _ | _Add both highlighted pairs. Carry waits for settle.3. Center Stack3. Center StackAdd all 3 highlighted pairs.739times7397x7492 pairs423 pairs1352 pairs9x9Active multiplication train windowraw windowsraw -> 49 | 42 | 135 | _ | _Add all 3 highlighted pairs. Carry waits for settle.4. Right Cross4. Right CrossAdd both highlighted pairs.739times7397x7492 pairs423 pairs1352 pairs549x9Active multiplication train windowraw windowsraw -> 49 | 42 | 135 | 54 | _Add both highlighted pairs. Carry waits for settle.5. Right Edge5. Right EdgeUse the highlighted right edge pair.739times7397x7492 pairs423 pairs1352 pairs549x981Active multiplication train windowraw windowsraw -> 49 | 42 | 135 | 54 | 81Use the highlighted right edge pair. Carry waits for settle.6. Settle strip6. Settle stripSettle once.Keep ones; carry moves left.raw windows49 | 42 | 135 | 54 | 81settled strip54 | 6 | 1 | 2 | 1Final multiplication answer49 | 42 | 135 | 54 | 81 -> 546121.