Grade 5

Read the Headline Story to the students. Encourage them to think of creative ways to respond to the information in the story.

If the hidden amount is 10, you end up with 13. If the hidden amount is 20, you end up with 23. You could just add 3 to the hidden amount to figure out the result.

- The hundreds digit must be 9.
- The units digit must be 0, 2, 4, 6, or 8.
- If the units digit is 0, the number could be 930 or 990 because 9 + 3 + 0 is divisible by 6, as is 9 + 9 + 0.
- If the units digit is 2, the number could be 912 or 972, because the sum of the digits must be either 12, 18, or 24.
- There are only 5 other possibilities: 954, 936, 996, 918, and 978.
- The tens digit must be odd.
- If another clue was added, such as “The number I’m thinking of is the smallest number possible that can be made this way,” then a single number can be selected.

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