Borrowing, Carrying, Understanding
37 -19 Borrow 1, make the 7 into 17, then subtract 9. Borrowing and carrying. Simple math right? We've all done it. In math class, or balancing our checkbooks (pre-online banking). But what does it mean to borrow 1? A friend of mine, not a math lover, is preparing to become an elementary school teacher. She's currently taking a methods class in teaching math in elementary school, and she had an epiphany. About borrowing and carrying. "Borrowing and carrying don't explain the importance of place value. We always just borrowed and carried because that is what we were told. We never knew why."