## Reflection: Checks for Understanding Adding and Subtracting Integers on a Number Line - Section 4: Interceptions

I asked for a student to explain what happens when there is an interception in football.  Then I showed a quick video clip of an interception.  I explained that we can tell there is an interception by seeing that one value is positive and one value is negative.  I continued to mention that since the sign was addition, each team was gaining yards and moving towards their own end zone.

I continued to pick volunteers to act out the problems and do the “play by play”.  Students worked on the practice problems independently.  Problem 5 was problematic for some students.  Some students first drew a red line from 0 to -6 and then drew a yellow line from 0 to 6, instead of a yellow line from -6 to 0.  I called on students to act this out.  I asked students, “At which yard line does the yellow team get possession of the ball?”  Students were able to tell me that the yellow team got the ball at the -6 yard line.  Then the yellow team gains 6 yards towards their own endzone.

Clarifying Mistakes
Checks for Understanding: Clarifying Mistakes

# Adding and Subtracting Integers on a Number Line

Unit 3: Integers and Rational Numbers
Lesson 5 of 17

## Big Idea: What happens when you add positive 5 and negative 3? What happens when you subtract positive 2 from negative 3? Students work with a number line and football to model adding and subtracting integers.

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Standards:
Subject(s):
Math, Integers, Number Sense and Operations, number line, 6th grade, master teacher project, adding integers, subtracting integers
60 minutes

### Andrea Palmer

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