Metric Units
What unit do we use to measure small things like a pencil?
Centimetres (cm)
How many cm are in 1 metre?
100cm
What tool(s) do we use to measure length?
Ruler, metre stick, or measuring tape
Estimate: How long is a crayon?
About 10-15cm
Jane has a ribbon that is 45cm long. She cuts off 15cm. How much is left?
30 centimetres (45 - 15 = 30)
What metric unit is best for measuring a doorway?
Metres (m)
How many mm are in 1cm?
10mm
What is a metre stick used for?
To measure objects about 1 metre long.
Estimate: How tall is your desk in cm?
About 60-75cm
A rope is 2m long. If you cut it into 4 equal parts, how long is each piece?
50 centimetres or 0.5 metres (2 divided by 4)
Which is longer: 1m or 100cm?
They are equal. 100cm=1m
Convert 300cm to metres.
3 metres
How do you measure something that's longer than your ruler?
Measure in sections and add them together.
Estimate: How wide is a car in metres?
About 2 metres
You walk 1.5m, then 250cm. How far did you go?
400 metres (1.5m = 150cm + 250cm = 400cm = 4m)
Name 3 things you would measure in centimetres.
e.g. book, pencil case, desk height
Convert 2.5 metres to cm.
250 centimetres
Why is it important to start measuring at 0?
Because starting at 0 gives an accurate measurement.
Estimate: How long is the school hallway?
About 20-30 metres
Your pencil is 175mm. Your friend's is 20cm. Whose is longer?
Friend's pencil is longer (20cm = 200mm > 175mm)
What's the nest unit to measure a football field?
Metres (m)
Convert 1750mm to metres.
1.75m (1750 divided by 1000)
What tool would you use to measure a hallway? Why?
Measuring tape- it's long and flexible.
Estimate: How tall is a door in mm?
About 2000 millimetres
A board is 1.75m. You need 200cm. Do you have enough?
No (1.75m = 175cm, you are 25cm short)