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Determine The Unknown Number In The Addition...

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

 

These worksheets support 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

(Page last edited 10/16/2017)

 

There are 100 worksheets available on this topic. Click on the thumbnails below to preview and download the worksheets.


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Answer Key:

The answer keys corresponding to these worksheets may be found here: http://i4c.xyz/ycj2mdte.

Teachers may request access to an answer key for all Internet4Classrooms printable practice sheets by going here: http://i4c.xyz/n89msyv.

Internet4classrooms is a collaborative effort by Susan Brooks and Bill Byles.
 

  

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