High School

1. How do you determine if a year is a leap year?

2. How many days are there from January 14, 2019, to March 10, 2019?

3. How many days are there from February 14, 2000, to June 20, 2020?

4. How many days are there in two weeks?

5. How many hours are there in a week?

6. How many days are there in 2 days and 2 hours?

7. How many hours are there in two weeks?

Answer :

  1. A year is a leap year if it meets the following criteria:

    • It is divisible by 4.
    • However, if the year is divisible by 100, it must also be divisible by 400.
      For example, the year 2000 was a leap year because it is divisible by 400, while 1900 was not a leap year because it is divisible by 100 but not by 400.
  2. To calculate the number of days from 14 January 2019 to 10 March 2019:

    • January 14 to January 31: 17 days (January has 31 days)
    • February: 28 days (2019 is not a leap year)
    • March 1 to March 10: 10 days
    • Total = 17 + 28 + 10 = 55 days
  3. To calculate the number of days from 14 February 2000 to 20 June 2020:

    • 14 February 2000 to 13 February 2020: 3652 days (10 years including leap years 2000, 2004, 2008, 2012, 2016)
    • 14 February 2020 to 20 June 2020: 127 days (February 14 to June 20 in a leap year)
    • Total = 3652 + 127 = 3779 days
  4. There are 14 days in two weeks because a week consists of 7 days.

  5. There are 168 hours in a week.

    • (7 days per week) × (24 hours per day) = 168 hours
  6. There are 2.0833 days in 2 days 2 hours.

    • 2 full days = 2 days
    • 2 hours = [tex]\frac{2}{24}[/tex] of a day = [tex]\frac{1}{12}[/tex] day ≈ 0.0833 day
    • Total ≈ 2 + 0.0833 = 2.0833 days
  7. There are 336 hours in two weeks.

    • (2 weeks) × (168 hours per week) = 336 hours