2.5.1

Units of Time

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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

Units of time

  • The units of time from shortest to longest are:
  • Second, minute, hour, day, week, month, year, century, millennium.
Relations between units

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

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

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

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

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.
Jump to other topics
1

Year 3 - Number

1.1

Number & Place Value

1.1.1Multiples1.1.2Counting in Multiples1.1.3Recognising Three-Digit Numbers1.1.4Finding 10 More or Less than a Number1.1.5Finding 100 More or Less than a Number1.1.6Ordering & Comparing Numbers up to 1,0001.1.7Writing & Reading Numbers1.1.8Representing Numbers
1.2

Addition & Subtraction

1.2.1Mental Addition & Subtraction1.2.2Column Method1.2.3Estimating Calculations1.2.4Inverse Operations1.2.5Missing Number Problems1.2.6Real-Life Problems
1.3

Multiplication & Division

1.3.1Times Tables1.3.2Using Times Tables1.3.3Multiplying Numbers1.3.4Missing Number Problems1.3.5Real-Life Problems
1.4

Fractions

1.4.1Tenths1.4.2Fractions1.4.3Fractions Equal to a Whole1.4.4Equivalent Fractions1.4.5Fractions of Shapes1.4.6Fractions of Amounts1.4.7Add & Subtract Fractions1.4.8Compare & Order Fractions
2

Year 3 - Measurement

2.1

Length

2.1.1Length2.1.2Comparing Lengths2.1.3Add & Subtract Lengths2.1.4Perimeter
2.2

Mass

2.2.1Mass2.2.2Comparing Masses2.2.3Add & Subtract Masses
2.3

Volume & Capacity

2.3.1Volume & Capacity2.3.2Comparing Volumes2.3.3Add & Subtract Volumes
2.4

Money

2.4.1Money2.4.2Counting Money2.4.3Adding & Subtracting Money
2.5

Time

2.5.1Units of Time2.5.2Clocks2.5.3Telling the Time2.5.4Time of the Day2.5.512-Hour & 24-Hour Clocks2.5.6Measuring Time
3

Year 3 - Geometry

3.1

Angles

3.1.1Angles in Degrees3.1.2Types of Angle
3.2

Properties of Shapes

3.2.12D Shapes3.2.23D Shapes
3.3

Straight Lines

3.3.1Straight Lines3.3.2Parallel & Perpendicular Lines
4

Year 3 - Statistics

4.1

Statistics

4.1.1Statistics4.1.2Pictograms & Bar Charts
5

Year 4 - Number

5.1

Number & Place Value

5.1.1Counting in Multiples5.1.2Recognising Four Digit Numbers5.1.3Find 1,000 More or Less than a Number5.1.4Negative Numbers5.1.5Ordering & Comparing Numbers Over 1,0005.1.6Representing Numbers5.1.7Rounding Numbers5.1.8Roman Numerals
5.2

Addition & Subtraction

5.2.1Written Methods for Adding Large Numbers5.2.2Written Methods for Subtracting Large Numbers5.2.3Estimation & Inverse Operations5.2.4Solving Two-Step Problems
5.3

Multiplication & Division

5.3.1Times Tables5.3.2Using Times Tables5.3.3Multiplication Rules5.3.4Column Method5.3.5Factors
5.4

Fractions & Decimals

5.4.1Identifying Equivalent Fractions5.4.2Adding & Subtracting Fractions5.4.3Hundredths5.4.4Decimals5.4.5Converting Between Decimals & Fractions5.4.6Rounding Decimals5.4.7Ordering Decimals
6

Year 4 - Measurement

6.1

Units

6.1.1Metric Measurements6.1.2Adding & Subtracting Money
6.2

Time

6.2.1Converting Units of Time6.2.2Changing the 12-Hour Clock to the 24-Hour Clock6.2.3Changing the 24-hour Clock to the 12-Hour Clock
7

Year 4 - Geometry

7.1

Properties of Shapes

7.1.1Symmetry7.1.2Types of Triangle7.1.3Quadrilaterals
7.2

Perimeter & Area

7.2.1Perimeter7.2.2Area
7.3

Position & Direction

7.3.1Coordinates7.3.2Translation
8

Year 4 - Statistics

8.1

Statistics

8.1.1Types of Data8.1.2Pictograms & Bar Charts8.1.3Line Graphs

Practice questions on Units of Time

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    Units of TimePut in order
  2. 2
    Units of TimePut in order
  3. 3
    Which of the following is correct?Multiple choice
  4. 4
    How many months are there in a year?Multiple choice
  5. 5
    How often do leap years occur?Multiple choice
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Adding & Subtracting Money

Clocks