Before measuring something, you need to know what unit to use. You can do this by estimating its approximate size. For measures such as speed you will use a formula.
Which unit is not a metric unit?
Which unit of measurement would you use to measure the length of a school hall?
What's the likely height of a classroom door?
What's the reading on this scale?
How many is ?
How many are there in ?
Convert into .
Correct to the nearest , the crowd in a stadium is people. What's the smallest possible number of people in the stadium?
If you travel in , what is your average speed?