Page 94 - Knowledge Organiser Yr7 24-25

Knowledge Base: Mathematics TOPIC 3: Measures and Conversions Year 7 | Autumn Term 2
By the end of this topic you should be able to:
• Read a scale on a measuring instrument
• Convert between metric units of length
• Know and convert between metric units of mass and capacity
• Convert between metric and imperial units
• Convert between units of time
Language
Meaning
Example
Metric system
In the metric system, units of measurement are related by powers of 10
10mm = 1cm 100cm = 1m
Length
How long something is
The length of a man’s stride is about 1m
Mass
How heavy something is
The typical mass of a bag of sugar is 1kg
Capacity
How much something holds
The typical capacity of a drinks can is 330ml
Time
Time is measured in seconds, minutes and hours
1 minute = 60 seconds 1 hour = 60 minutes
1 day = 24 hours
Metric unit
A unit of measurement from the metric system which is based on powers of 10
Centimetres, metres, kilometres, grams, kilograms, tonnes are examples of metric units
Imperial unit
An alternative system of measurement of metric units
Inches, feet, yards, miles, ounces, pounds, stone, tons are examples of imperial units
Speed
A measure of the weight at which distance is covered
The speed of sound travelling through air is roughly 343 m/s
Important things to remember:
1) Kilo means 1000
2) Centi means 100th
3) Milli means 1000th
4) Make sure you convert correctly. There is 100 cm in 1m so 3.2 m is 3.2 x 100 = 320 cm
5) Check if your answer is sensible.
Your journey to school is NOT 500 km!
Worked examples
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