2.7.E.21 - Identify Unknown Numbers on a Number Line Diagram by Using the Distance Between Numbers and Reference Points – Exit Ticket

From EngageNY.org of the New York State Education Department. Grade 2 Mathematics Module 7, Topic E, Lesson 21. Internet. Available from https://www.engageny.org/resource/grade-2-mathemat...; accessed 29/Mar/2016.