Squares Level 15: 3d square mastery H:4-6. multiplication window train. 1. Left Edge459 squared equals 459 times itself1. Left EdgeUse the highlighted left edge pair.459times4594x4162 pairs3 pairs2 pairs9x9Active multiplication train windowraw windowsraw -> 16 | _ | _ | _ | _Use the highlighted left edge pair. Carry waits for settle.2. Left Cross2. Left CrossAdd both highlighted pairs.459times4594x4162 pairs403 pairs2 pairs9x9Active multiplication train windowraw windowsraw -> 16 | 40 | _ | _ | _Add both highlighted pairs. Carry waits for settle.3. Center Stack3. Center StackAdd all 3 highlighted pairs.459times4594x4162 pairs403 pairs972 pairs9x9Active multiplication train windowraw windowsraw -> 16 | 40 | 97 | _ | _Add all 3 highlighted pairs. Carry waits for settle.4. Right Cross4. Right CrossAdd both highlighted pairs.459times4594x4162 pairs403 pairs972 pairs909x9Active multiplication train windowraw windowsraw -> 16 | 40 | 97 | 90 | _Add both highlighted pairs. Carry waits for settle.5. Right Edge5. Right EdgeUse the highlighted right edge pair.459times4594x4162 pairs403 pairs972 pairs909x981Active multiplication train windowraw windowsraw -> 16 | 40 | 97 | 90 | 81Use the highlighted right edge pair. Carry waits for settle.6. Settle strip6. Settle stripSettle once.Keep ones; carry moves left.raw windows16 | 40 | 97 | 90 | 81settled strip21 | 0 | 6 | 8 | 1Final multiplication answer16 | 40 | 97 | 90 | 81 -> 210681.