Subtraction Stress

Mental subtraction is not my favorite math unit to teach.  I mixed the order of the lessons up a bit, thinking I would make it easier on the class.  Unfortunately, today seemed stressful just the same.  Our lesson was on using a hundreds chart to subtract.  This is the same process as when we used the chart to add, but several students were not seeing the similarities.  It was a stressful hour, but we made it through.  As your looking at your child's papers tonight, ask him/her to explain the process to you.  Teaching is a great way to learn!