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Adding Two-Digit Numbers Given One

Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to make a true equation.

Hint

Hint

How can we ensure that all numbers will be 2-digits?

Answer

Answer

There are many answers including 27 + 53 = 80. Wrong answers include 76 + 53 = 129 because the sum needs to be two-digits.

Source: Robert Kaplinsky

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18 comments

  1. Christine Roberts

    I am thinking that the digits should be changed to include 0-9 in order to have a solution such as 27 + 53 = 80 (sample answer). If you want to use only the digits 1-9, then a different sample answer should be provided such as 26 + 53 = 79.

  2. Should 5 and 3 be excluded since they are already in the problem?

  3. My 1st graders came up with a number of solutions. 12 + 53 = 65 , 26 + 53 = 79 , 20 + 53 = 73, 10 + 53 = 63 , and 41 + 53 = 63. Afterwards, the class tried to find the lowest/highest sum.

  4. My son (Kindergarten) came up with the following combinations. Avoiding the 30’s was a challenge for him but he did well: 14 + 53 = 67, 27 + 53 = 80, and 26 + 53 = 79. Asking the right questions without leading him on was great for making him think. His “a-ha” moment came when he found 47 + 53 = 100. He said, “I guess it has to be less than 47.”

  5. 14 +53= 67

  6. 12+53=65

  7. 30 + 53 = 83

  8. 14+53=67

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