Tag Archives: modular arithmetic

Who’s the oldest?

Katie’s birthday is on October 2.  Our school district’s policy for going to first grade is “6 years old by October 1”, and they are very strict about it.  Katie knows this fact, and fortunately, she is very happy about … Continue reading

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Monday Starts on Saturday

Here is an amusing conversation that I had with Katie today. Me: Katie, what day of the week is it? Katie: Friday. Me: And what day of the week will it be in seven days? Katie: Friday. Me: And what … Continue reading

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