As in most math classes, our class counts everyday in some way. In first grade counting by tens starting at any number is a skill that has to be mastered. This is one way we count everyday. We count forwards and backwards by tens, and when we end they always tell me the NEGATIVE NUMBER!! For example, 112, 102, 92, 82, 72, 62, 52, 42, 32, 22, 12, 2, -8. Yes, they figured it out for themselves based on their knowledge of making ten. With this being said, the video I posted uses this negative number knowledge to solve subtraction. This is much more "real life" than borrowing. It is a great way to give them some background knowledge before we actually expect them to have a full understanding of negative numbers. Another great experience in the minds of first graders!
Aimee