Multiplication Level 16: 3d x 3d (minimal carry). multi-digit window train. 1. Left Edge213 times 1211. Left EdgeUse the highlighted left edge pair.213times1212x122 pairs3 pairs2 pairs3x1Active multiplication train windowraw windowsraw -> 2 | _ | _ | _ | _Use the highlighted left edge pair.2. Left Cross2. Left CrossAdd both highlighted pairs.213times1212x122 pairs53 pairs2 pairs3x1Active multiplication train windowraw windowsraw -> 2 | 5 | _ | _ | _Add both highlighted pairs.3. Center Stack3. Center StackAdd all 3 highlighted pairs.213times1212x122 pairs53 pairs72 pairs3x1Active multiplication train windowraw windowsraw -> 2 | 5 | 7 | _ | _Add all 3 highlighted pairs.4. Right Cross4. Right CrossAdd both highlighted pairs.213times1212x122 pairs53 pairs72 pairs73x1Active multiplication train windowraw windowsraw -> 2 | 5 | 7 | 7 | _Add both highlighted pairs.5. Right Edge5. Right EdgeUse the highlighted right edge pair.213times1212x122 pairs53 pairs72 pairs73x13Active multiplication train windowanswer strip213 x 121 = 25773Use the highlighted right edge pair.
