AIM: How are the algorithms for addition and subtraction related?
Class: Today we discussed the subtraction algorithm students will eventually use to solve all rational number problems. We discovered yesterday that subtracting a negative is the same thing as adding a positive. We also discussed that subtracting a positive is the same as adding a negative. This led us to: Keep, change, change. Students worked in groups to answer parts B-D of problem 2.3 on pages 40-41.
See resources from yesterday.