Calendar Problems
1. Which day of the week will it be
a. 6 weeks from today?
b. 10 weeks and 4 days from today?
c. 122 days from today?
d. Exactly one year (365 days) from today?
2. John F. Kennedy was inaugurated on January 20, 1961. He was President of the
US until his death on Friday, November 22, 1963. On what day of the week was
he inaugurated?
3. Which day of the week was it
a. 3 weeks ago from today?
b. - 35 days (35 days ago)?
c. - 15 days?
d. - 52 days?
e. January 1, 2014?
4. What is an easy way to find the day of the week whether one goes forward or
backward in time? Can you find an efficient mathematical method or
representation?
5. Apply your method to the following questions:
a. Anh and his mother have a birthday this year on the same day of the
week. His birthday is October 15, hers is in November. If Anh’s birthday a
Wednesday this year, what might be the date of her birthday in
November?
b. Will Anh and his mother always share a day of the week for their
birthdays? Explain.
6. What are all the numbers of days from today that will yield the same day of the
week as today? i.e. if today is a Tuesday, what are all the numbers of days ago or
days forward that will be Tuesdays? If today is a Tuesday, what are all the
numbers of days that will land on a Wednesday? Devise a mathematical method
to determine the number of days forward or backward of all of the days that will
land on the same day of the week of any day of the week chosen.
2 Calendar Problems