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Information about Lisa_time

Published on December 1, 2008

Author: lisamahon


Slide 1: TIME By Lisa Mahon Slide 2: Time Conversion Slide 3: Some examples 1. How many seconds in 3 minutes? 3min x 60 = 180 seconds 2. How many seconds in 2 hours? 2 hours x 60 x 60 = 7200 seconds 3. How many minutes in 1 week? 1 week x 7 x 24 x 60 = 10080 minutes Slide 4: Some examples 1. How many minutes in 240 seconds? 240 sec  60 = 3 minutes 2. How many hours in 7200 seconds? 7200 seconds  60  60 = 2 hours 3. How many weeks in 60480 minutes? 60480 mins  60  24  7 = 6 weeks Slide 5: This verse helps you remember how many days are in each month: 30 days have September, April, June and November; All the rest have 31 Except February alone, Which has 28 days clear, And 29 in each leap year. or Slide 6: Each knuckle represents 31 days Slide 7: Some other time facts 1 year 365 days 1 leap year 366 days Do you know why we have leap years? It takes the earth 365 days and 6 hours to travel around the sun. Because 4 x 6 hours equals 24 hours (one day), every 4 years we add an extra day to balance the calendar. Before a leap-year calendar was used, the seasons drifted around the calendar (the drift is about 1/4 day or 6 hours each year). For example, over three hundred years, July would go from winter to Autumn. Our current calendar is called the Gregorian calendar; this calendar was devised by Aloysius Lilius (an Italian physician) and named for Pope Gregory who decreed in 1582 that it be used in Catholic areas. This calendar wasn't adopted in Britain and the American Colonies until 1752. Slide 8: If 4 divides evenly into the year, it is a leap year. However, the exception to the rule is that centuries must be evenly divided by 400. Therefore the year 2000 was a leap year, as it was divisible by 400, whereas 1900 was not. Do you know how to determine a leap year? Image: Connection maths 7 Slide 9: 1 century = 100 years 1 decade = 10 years Some special terms used in time are: midday or noon 12 o’clock in the day midnight 12 o’clock at night am from midnight to midday pm from midday to midnight More time facts

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