Example 1: Counting On to Express the Sum as Absolute Value on a Number Line

This Instructional Activity is a part of the Lesson 3, Unit 2, Grade 7. The teacher leads whole-class instruction using vector addition to review the sum of two integers on a real number line horizontally and vertically and show that the sum is the distance of the absolute value of the q-value (second addend) from the p-value (first addend).