Welcome to Math Quiz #24582

Determine the Unknown Number in the Addition or Subtraction Equation (up to 20)

There are 10 problems in this quiz which support the following standard:

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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