Multiplication Level 6: 2d x 2d (no tens carry). 2x2 window scan. 1. Left edge21 times 131. Left edgeStart with the leftmost window.21times13Active multiplication windowraw windows2raw -> 2 | _ | _Start with the leftmost window.2. Cross window2. Cross windowAdd both crossing products.21times13Active multiplication windowraw windows27raw -> 2 | 7 | _Add both crossing products.3. Right edge3. Right edgeFinish the ones product.21times13Active multiplication windowanswer strip27321 x 13 = 273Finish the ones product.
