Multiplication Level 10: 2d x 2d (mastery). 2x2 window scan. 1. Left edge67 times 891. Left edgeStart with the leftmost window.67times89Active multiplication windowraw windows48raw -> 48 | _ | _Start with the leftmost window.2. Cross window2. Cross windowAdd both crossing products.67times89Active multiplication windowraw windows48110raw -> 48 | 110 | _Add both crossing products.3. Right edge3. Right edgeFinish the ones product.67times89Active multiplication windowraw windows4811063raw -> 48 | 110 | 63Finish the ones product.4. Settle strip4. Settle stripSettle once.Keep ones; carry moves left.raw windows48 | 110 | 63settled strip59 | 6 | 3Final multiplication answerKeep 1s; extra carry moves left.
