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# Determine the Unknown Number in 4-Digit to 6-Digit Addition Equation.

These worksheets support the following Common Core State Standard:

CCSS.Math.Content.4.NBT.B.4

Fluently add and subtract multi-digit whole numbers using the standard algorithm.

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

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