Measuring Time

We need to be able to measure and calculate with time to work out how long something takes or what time something will happen.

Duration

Duration means how long something takes or lasts.
A school starts the day at 9am.
The first morning session lasts until breaktime at 10:20 am (twenty minutes past ten in the morning).
Work out the duration of the first session.

Answer

Counting on is a good way to calculate how long it is from one time to another.
- From 9am to 10am is 1 hour.
- From 10am to 10:20 is 20 minutes.
The duration of the first session is 1 hour and 20 minutes.
We don't write this as 1:20 as duration is an amount of time, not a time of day.

Using duration

If we know what time something starts and how long it takes (the duration), we can work out when it will end.
A car journey takes 2 hours and 10 minutes.
The journey starts at 2:15pm (quarter past two in the afternoon).
When will the journey end?

Answer

Count up the hours first.
- 2 hours + 2 hours = 4 hours
Count up the minutes.
- 15 minutes + 10 minutes = 25 minutes
The journey will end at 4:25pm (twenty-five past 4 in the afternoon).

Adding up minutes

Sometimes the minutes add up to more than 60.
This means we need to think about hours and minutes.
- 60 minutes = 1 hour.
- 120 minutes = 2 hours.
- 70 minutes = 1 hour and 10 minutes.

1Year 3 - Number

2Year 3 - Measurement

2.1Length

2.1.1Length

2.1.2Comparing Lengths

2.1.3Add & Subtract Lengths

2.1.4Perimeter

2.2Mass

2.2.1Mass

2.2.2Comparing Masses

2.2.3Add & Subtract Masses

2.3Volume & Capacity

2.3.1Volume & Capacity

2.3.2Comparing Volumes

2.3.3Add & Subtract Volumes

2.4Money

2.4.1Money

2.4.2Counting Money

2.4.3Adding & Subtracting Money

2.5Time

2.5.1Units of Time

2.5.2Clocks

2.5.3Telling the Time

2.5.4Time of the Day

2.5.512-Hour & 24-Hour Clocks

2.5.6Measuring Time

3Year 3 - Geometry

3.1Angles

3.1.1Angles in Degrees

3.1.2Types of Angle

3.2Properties of Shapes

3.2.12D Shapes

3.2.23D Shapes

3.3Straight Lines

3.3.1Straight Lines

3.3.2Parallel & Perpendicular Lines

4Year 3 - Statistics

4.1Statistics

4.1.1Statistics

4.1.2Pictograms & Bar Charts

5Year 4 - Number

6Year 4 - Measurement

6.1Units

6.1.1Metric Measurements

6.1.2Adding & Subtracting Money

6.2Time

6.2.1Converting Units of Time

6.2.2Changing the 12-Hour Clock to the 24-Hour Clock

6.2.3Changing the 24-hour Clock to the 12-Hour Clock

7Year 4 - Geometry

7.1Properties of Shapes

7.1.1Symmetry

7.1.2Types of Triangle

7.1.3Quadrilaterals

7.2Perimeter & Area

7.2.1Perimeter

7.2.2Area

7.3Position & Direction

7.3.1Coordinates

7.3.2Translation

8Year 4 - Statistics

8.1Statistics

8.1.1Types of Data

8.1.2Pictograms & Bar Charts

8.1.3Line Graphs

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