Big Idea
Units tell you what the number measures, so converting units is part of the answer.
Measurement and Units
Convert units and solve measurement problems accurately.
Understand it first
Metric links
1 m = 100 cm and 1 kg = 1000 g.
Same unit first
Calculations are safer when all numbers use the same unit.
Reasonableness
A door is measured in metres, not millimetres or kilometres.
Method Ladder
Use this same ladder every time you meet this topic.
- Identify the starting unit and target unit.
- Choose multiply or divide using the unit link.
- Convert before calculating if needed.
- Write the final unit clearly.
Worked example: Convert 3.5 m to cm
- 1 m = 100 cm.
- Metres to centimetres means multiply by 100.
- 3.5 x 100 = 350.
- Answer: 350 cm.
Fix It Lab
Read these before the quiz. They are the traps that lose marks.
- Common mistakeMultiplying when you should divide.
- Common mistakeMixing units in the same calculation.
- Common mistakeLeaving the unit off the answer.
Top-mark challenge
Open challenge
A ribbon is 2.4 m long. How many centimetres is that?
Write full working and one sentence explaining the method.
10-question unlock quiz
The quiz is now on separate pages. You answer one question, then the next question opens. Finish Question 10 to complete this mission.
Start Question 1