Units of Time
Maths: Year 3 & 4 National Curriculum, topic 2.5.1
Units of Time
Units of time are not part of the decimal system so they do not go up in powers of 10.
Units of time
- The units of time from shortest to longest are:
- Second, minute, hour, day, week, month, year, century, millennium.
Relations between units
- These are the number of shorter time units in the next bigger one.
- 60 seconds = 1 minute.
- 60 minutes = 1 hour.
- 24 hours = 1 day.
- 7 days = 1 week.
- 4 weeks is roughtly the same as 1 month.
- 12 months = 1 year.
- 100 years = 1 century.
- 1000 years = 1 millenium.
Days in a year
- 1 calendar year is equal to 365 days.
- However, 1 year is actually closer to 3651/4 days long.
- This means every four years we have an extra ‘catch up’ day called a leap year.
- A leap year has 366 days.
- The extra day is always 29th February.
Months of the Year
There are twelve months in a year. Some months have more days than others.
Months of the Year
- The names of the months of the year in order are:
- January, February, March, April, May, June, July, August, September, October, November, December.
Number of days
- The months do not all have the same number of days.
- Some have 30 and some have 31.
- February has only 28, unless it is a leap year.
- During a leap year, February has 29 days.
Remembring days in a month
- Here is an old English poem to learn the number of days in each month:
- Thirty days hath September,
- April, June, and November;
- All the rest have thirty-one,
- Excepting February alone,
- And that has twenty-eight days clear
- And twenty-nine in each leap year.
Test yourself on Units of Time
Units of Time
Units of Time
Which of the following is correct?
How many months are there in a year?
How often do leap years occur?