Multiplication Level 9: 2d x 2d (any). 2x2 window scan. 1. Left edge58 times 731. Left edgeStart with the leftmost window.58times73Active multiplication windowraw windows35raw -> 35 | _ | _Start with the leftmost window.2. Cross window2. Cross windowAdd both crossing products.58times73Active multiplication windowraw windows3571raw -> 35 | 71 | _Add both crossing products.3. Right edge3. Right edgeFinish the ones product.58times73Active multiplication windowraw windows357124raw -> 35 | 71 | 24Finish the ones product.4. Settle strip4. Settle stripSettle once.Keep ones; carry moves left.raw windows35 | 71 | 24settled strip42 | 3 | 4Final multiplication answerKeep 1s; extra carry moves left.
