This file contains 64 pages of addition and subtraction activities and games with unknown numbers. These activities can be used for guided practice, independent practice or math centers!
CCSS.Math 1.OA.D.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 = _.
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