The number line below shows the four scores that Andy has at the end of each of the four rounds of a science competition. Points can either be added to or deducted from the previous round's score depending on how many questions he answered correctly or incorrectly. 900 800 700 + Round 2 (710 points) 600 500 + Round 4 (495 points) 400 300 200 + Round 3 (210 points) 100 0 -100 -200 -300 Round 1(-320 points) Enter the difference, in points, between the scores after Round 1 and after Round 4. ©2021 Illuminate Education, Inc.