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Students learn how to use 12 and 24 hour time and convert between metric and imperial units of length, capacity and weight using ratio notation. As learning progresses students read and draw their own real life conversion graphs.

This unit takes place in Term 3 of Year 9 and is followed by Compound Measures.

**Prerequisite Knowledge**

- multiply and divide whole numbers and those involving decimals by 10, 100 and 1000
- measure, compare, add and subtract: lengths (m/cm/mm); mass (kg/g); volume/capacity (l/ml)
- tell and write the time from an analogue clock, including using Roman numerals from I to XII, and 12-hour and 24-hour clocks

**Success Criteria**

- use standard units of measure and related concepts (length, area, volume/capacity, mass, time, money, etc.)
- measure line segments and angles in geometric figures, including interpreting maps and scale drawings

**Key Concepts**

- Understanding and apply the keywords is vital throughout this topic.
- Metric terms such as milli, cent, kilo need to be associated with their numerical equivalences.
- Relate metric conversions to multiplying and dividing by 10, 100 and 1000.
- Practical measuring activities using the appropriate equipment helps students to remember the imperial/metric conversions.

**Common Misconceptions**

- Students sometimes fail to recognise that imperial and metric units are two distinct sets of measurements.
- Remembering the metric/imperial conversions often prove difficult for most students.
- Students may have difficulty with the numerical conversions, especially with imperial units. Encourage the use of calculators when appropriate.

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