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| Math Central | Quandaries & Queries |
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Question from gracie, a student: 9^23 units digit |
Hi Gracie,
Sometimes with a math problem you just have to experiment.
What is the units digit of $9^1?$
What is the units digit of $9^2?$
What is the units digit of $9^3?$
What is the units digit of $9^4?$
What is the units digit of $9^5?$What is the units digit of $9^{23}?$
Why?
Penny
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