Complete the equation and model each sum on a number line. +4=0 a. b. -5 + C. = 0 When will the sum of two numbers be zero? a. positive sum: -5 + 2 In the first box of each equation, write an example of an integer that will result in the sum described. Then write the sum. Model each sum on a number line. b. negative sum: -4+ -6-5-4-3-2-1 Curriculum Associates, LLC Copying is not permitted. HH -6-5-4-3-2-1 +++ -6-5 -4 -3 -2 -1 -6 -5 -4 -3 -2 -1 0 HHH 2 3 0 1 0 1 HHH 2 3 4 1 2 3 4 4 5 6 5 6 5 6 H 0 1 2 3 4 5 6 Lesson 1 Understand Addition of Positive and Negative Integers 5