3.1.2

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

Test yourself

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

You may be asked to convert a time from the 12-hour clock to the 24-hour clock.

Illustrative background for Example problemIllustrative background for Example problem ?? "content

Example problem

  • What is 6.30pm in the 24-hour clock?
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Change to the 24-hour clock

  • 6.30pm is in the afternoon, so we need to add 12 to the first number to get the time in the 24-hour clock.
    • 6 + 12 = 18
      • So 6.30pm is 18.30 in the 24-hour clock.
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Example problem

  • What is 8.45am in the 24-hour clock?
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Change to the 24-hour clock

  • 8.45am is in the morning, so the hourly time stays the same in the 24-hour clock.
    • 8.45am is 08.45 in the 24-hour clock.
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What about 12am?

  • 12am is written as 00.00 in the 24-hour clock.
    • So 12.59am would be 00.59 in the 24-hour clock.

Jump to other topics

1Angles

1.17 Facts About Angles

1.1.1Facts About Angles

1.1.2More Facts About Angles

1.2Identify the Angle

1.2.1Identify the Angle

1.3Angles on a Straight Line

1.3.1Angles on a Straight Line

1.3.2Angles on a Straight Line - Practice Questions

1.4Angles in a Circle

1.4.1Angles in a Circle

1.5Angles in Triangles

1.5.1Angles in a Triangle

2Fractions

2.1Simplifying Fractions

2.1.1Simplifying Fractions

2.1.2Identifying Equivalent Fractions

2.2Improper Fractions & Mixed Numbers

2.2.1Improper Fractions & Mixed Numbers

2.2.2Converting Mixed Numbers to Improper Fractions

2.2.3Converting Improper Fractions to Mixed Numbers

2.3Fractions of Numbers

2.3.1Fractions of Numbers

2.4Expressing Shaded Areas as Fractions

2.4.1Expressing Shaded Areas as Fractions

3Time

3.112-Hour & 24-Hour Clocks

3.1.1Difference Between 12-Hour & 24-Hour Clocks

3.1.2Changing the 12-Hour Clock to the 24-Hour Clock

3.1.3Changing the 24-hour Clock to the 12-Hour Clock

3.2Time-Related Problems

3.2.1Time-Related Problems

3.2.2Timetable & Schedule Problems

4Prime Numbers

4.1Prime Numbers

4.1.1Prime Numbers

5Probability

5.1Probability

5.1.1Probability Scale

5.1.2Probability Fractions

5.1.3Experimental Probability

6Ratio

6.1Ratios

6.1.1Ratios

7Sequences

7.1Constant Sequences

7.1.1Constant Increase Sequences

7.1.2Constant Decrease Sequences

7.2Doubling & Halving Sequences

7.2.1Doubling Sequences

7.2.2Halving Sequences

7.3Alternating Patterns & Two-Step Sequences

7.3.1Alternating Pattern Sequences

7.4Two-Step Patterns

7.4.1Two-Step Patterns

7.5The nth Term

7.5.1Find the nth Term

7.5.2Using the nth Term

8Area & Perimeter

8.1Perimeter of a Quadrilateral

8.1.1Finding the Perimeter of a Quadrilateral

8.1.2Finding the Missing Length

8.2Area of a Quadrilateral

8.2.1Finding the Area of a Quadrilateral

8.2.2Finding the Missing Side of a Rectangle

8.2.3Finding the Missing Side of a Square

8.2.4Finding the Area of Irregular Shapes

8.3Area of a Triangle

8.3.1Finding the Area of a Triangle

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Difference Between 12-Hour & 24-Hour Clocks

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