Addition Level 2: 2d + 1d (no carry). answer-window addition. 1. Fill tens42 + 6Step 1: Fill tens42plus64raw windows4 + 0 = 4 then release 4running strip4Tens window: 4 + 0 = 4. Release 4.2. Fill onesStep 2: Fill ones42plus648raw windows2 + 6 = 8 then release 8running strip48Ones window: 2 + 6 = 8. Release 8.
