Subtraction Level 8: 2d - 2d (borrow ones). borrow-window subtraction. 1. Release tens83 - 471. Release tensRelease one digit; only borrow stays active.83minus478 - 4 - 1 = 3answer strip3Pay right borrow; release 3: 8 - 4 - 1 = 3.2. Release ones2. Release ones83minus4713 - 7 = 6answer strip36Borrow 10; release 6: 13 - 7 = 6.3. Read answer3. Read answerDrop finished digits; borrow is gone.3 | 6 -> 36answer 36Read 3 | 6 as 36; borrow is gone.
