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 addition and subtraction equations.
8. Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? – 3, 6 + 6 = ?.