The best resource you will ever have for Illustrative Math - 6th Grade - Unit 3 Lesson 3 - Converting Units - Double Number Line! Full reference sheet included for students Two graphic organizers (double number line and table) The table is also called a tic tac toe board!
Students can add or subtract the integers - or just determine if the answer is positive, negative, or zero. Both are useful skills! THE ANSWER IS A JACK-O-LANTERN
Adding 1, 10, 11, 20, and 21 on Open Number Line VERY Scaffolded! Walks children through adding sets of manageable numbers with repetition and leveling.