First Grade Common Core Math 1 OA.4 Subtraction As An Unknown-Addend Problem 1.OA.4 Practice provides two ways for students to practice and show mastery of their ability to understand subtraction as an unknown-addend problem.
It includes 40 distinct problems in two sets (129 slides in all!), with and without following answer slides. The PowerPoint file can be used on computers, or Promethean Activboard and Smart boards.
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Standard 1.OA.4 Understand and apply properties of operations and the relationship between addition and subtraction.
4. Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.