These Understanding the Meaning of the Equal Sign Organizers 1-3 for first graders address the following first grade common core standard: CCSS.Math.Content. OA.7 Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true and false. You will notice an increase in complexity as the organizers progress. Each organizer includes a bonus as well. Enjoy the free preview! You may want, when the students explain why the equation is true or false, to have them write on a separate sheet of paper if their writing is still quite big.