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| Math Central | Quandaries & Queries |
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Warren, a teacher: If 100^25-25 is written in decimal notation, what is the sum of digits? |
Warren,
Try some smaller exponents.
What is 1002 - 25? What is the sum of its digits?
What is 1003 - 25? What is the sum of its digits?
What about 10025 - 25?
Penny
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