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Adding Two-Digit Numbers (Elementary)

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) sum.



In the two-digit number, what does the digit on the left represent?  What does the digit on the right represent?



97 + 86 is one answer for the largest sum.  13 + 24 is the smallest sum.

Source: Robert Kaplinsky

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  1. My second grade class loves coming up with variations on this. My personal favorite so far is what is the largest sum you can make with the biggest difference between the two numbers? I also like what is the largest/smallest you can make with only even or odd numbers?


    96+87 for largest and 14+23 for smallest . Since you are only moving a “one”, the value of the sum remains the same

  3. 40+60=100

  4. 97+86

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