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Missing Digits

Directions: Fill in the blanks with digits to make the answer closer to 200 than 300.
What is one solution?
What other solutions can you find?
How many possible solutions are there?
How many possible solutions if you can’t use a digit more than once?



What is one number that is closer to 200 than 300? How can you get that number?
How can you keep track of your trials and answers so you can share them?
How might you organize your trials and answers to help you think about other solutions?



There are many possible answers. E.g. 432 – 199 = 233.
If digits can be repeated, there are 1225 possible ways.
If digits CANNOT be repeated, there are 700 possible ways.

Source: Marilyn BurnsGraham Fletcher

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