Cross Totals

Finally, it all adds up. Learners complete a number puzzle in which they investigate the sums of the digits one through nine in a cross pattern. They then try to determine what totals are possible and which ones are not before devising a proof showing they have them all.

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CCSS: Designed
Instructional Ideas

  • Have pupils discuss why an even number does not work in the center
  • Get individuals to share their strategies
Classroom Considerations

  • Some learners may get frustrated by going through all the possibilities to determine the totals
Pros

  • Task is one step in the process to achieve the CCSS Math Practices
  • The activity is open and allows for multiple access points
Cons

  • None
Common Core