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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.

Hint

Hint

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

Answer

Answer

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

Source: Robert Kaplinsky

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One comment

  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?

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