Subtracting with Zeroes

This powerpoint is a guide for modeling subtraction.  To fully understand math, the students need to understand what is happening in a problem.  Memorizing steps does not mean that the students comprehend what is happening.  Modeling is one of the best ways to learn math.  This example models using Base-10 blocks.

https://www.dropbox.com/s/9p93rno73n7wdsq/Subtracting%20with%20Zero.pptx

Subtracting with Zeroes Lesson Plan

• Lesson will be led with an interactive powerpoint.
• State the I Can Statement and add it to our Good Work board.
• Set:  Solve the 3-digit subtraction problem.  The class will solve the problem and revisit regrouping rules.
• Model:  The teacher will lead a model problem of how to solve a regrouping problem that has a zero in the tens place.  (Causes the problem solver to have to regroup twice)
• Guided Practice:  The students will be handed a slip of paper with 2 subtraction problems.  The students will solve the problems as the teacher walks through the classroom helping as needed.  Two student volunteers will solve and model each of the two subtraction problems and answer questions that other students may have.
• Independent Practice:  Students will work #1-6 in their math workbook.  Volunteers will solve the problems on the board.  Students will then solve #7, a word problem, on their paper then on the board.
• Closing:  Exit Slip with 3 subtraction problems, 2 standard and one word problem.