Unknown Whole Number in Subtraction Equation Assessment

Unknown Whole Number in Subtraction Equation Assessment
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Student will solve for the unknown whole number in these 10 subtraction equations. Subtraction equations have differences within 20.


CCSS.MATH.CONTENT.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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