Description/Download - Worksheet #23791, CCSS.Math.Content.1.OA.D.8 Grade 1 Mathematics Common Core

(Page last edited 10/16/2017)

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Problem Type: Determine the Unknown Number in the Subtraction Equation (up to 20).

This worksheet supports the following Common Core State 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 = ?.

Publisher: National Governors Association Center for Best Practices, Council of Chief State School Officers, Washington D.C.

Copyright Date: 2010