The posting focuses on te Common Core State Standard 1.0A.B4 for first grade. This standard is: Understand and apply properties of operations and the relationship between addition and subtraction.
CCSS.Math.Content.1.OA.B.4 Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
This entire posting has practice problems and assessments for CCSS1.0A.B4 These practice sheets can be copied, displayed on a white/Promethean Board, put in a small center for students to complete, or placed in a child’s math journal. There are several practice items for review and extension prior to giving the assessments. There are two assessments to administer to determine each student’s achievement of this standard after the use of the practice problems. It is always the best to begin at the conceptual level with manipulatives and practice prior to beginning the work with the algorithm in the practice problems. Once the students have the concept, these practice problems and assessments would be the next step. Use the language of the problems and practice these type problems in small guided math groups or in full group instruction.