Idea 11of 22Builds onArea is measured in squares
Smaller unit, more of them
Does a ribbon's number change if you change the unit?
Today you'll discover
- what stays the same
- what happens to the number
- how to check any change of unit
Think firstA ribbon 2 m long
In centimetres, will the ribbon's number be bigger or smaller than 2?
Decide first, then press Next. Watch the ribbon: does it ever change?
A ribbon drawn as a long bar, 2 m long. Under it, two tiles of 1 m each; then each metre cut into strips and marked 100 cm, 200 cm in all; then each metre marked 1000 mm, 2000 mm in all. The working reads 2 m = 200 cm = 2000 mm. The last step shows a rope 4 m long.
See the whole ideathe big idea and the key word, in one place
The big idea
The amount never changes. Choose a smaller unit and you need more of them.
One ribbon, three counts
The smaller the unit, the bigger the count.
- in m2
- in cm200
- in mm2000
Easy to get wrongIf the number gets smaller when you change to a smaller unit, you went the wrong way.
Key word
- convert
- write the same amount in a different unit
Ready to use it?
- Predict if a number gets bigger or smaller in a new unit.