First Grade Common Core Math 1 OA.8 Determine The Unknown Number 1.OA.8 Practice provides two ways for students to practice finding the unknown whole number in an addition or subtraction equation.
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.8 Work with a