Addition Level 8: 2d + 2d (both carry). answer-window addition. 1. Fill tens68 + 57Step 1: Fill tens68plus5711raw windows6 + 5 = 11 then keep 1; carry waitsrunning strip11Tens window: 6 + 5 = 11. Hold raw 11; carry settles later.2. Fill onesStep 2: Fill ones68plus571115raw windows8 + 7 = 15 then keep 5; carry waitsrunning strip115Ones window: 8 + 7 = 15. Hold raw 15; settle carry later.3. Settle carryStep 3: Settle carryKeep ones; carry moves left.raw windows11 | 15settled digits1 | 2 | 5answer 125Settle raw 11 | 15 into 125; keep ones and move carry left.
