Reflection: Subtraction Number Stories- Day 2 - Section 2: Presentation of Lesson


This lesson is very similar to my addition number stories lessons.  When I made the number story books for those lessons, I added a few lines to each page to guide the students' thinking.  For example, I drew a wavy line across the first page and told the students it was water.  There were two reasons that I did not do that for these lessons.  First, I wanted to give my students more freedom and see what ideas they could come up with.  Second, this quote from the standards was pointed out to me:  "Drawings need not show details, but should show the mathematics in the problem."  When I gave those guiding lines, I found that some of my students got carried away with adding details (a sun, grass, flowers, etc) and they made silly mathematical mistakes.  For this lesson, I wanted the students to really focus on representing the math and not the details in the picture. 

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Subtraction Number Stories- Day 2

Unit 7: Subtraction
Lesson 17 of 19

Objective: Students will be able to create their own number stories and represent them using one of the methods we have learned in this unit.

Big Idea: After reading If You Were a Minus Sign, students create their own number stories, by representing subtraction using pictures and possibly equations.

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subtraction example
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