Measurement and units
Last year you compared lengths and used cm and m. This year you go further:
- Length: convert between cm and m (and read a ruler).
- Weight: convert between g and kg.
- Volume: convert between ml and l.
- Compare measurements that use different units.
Why three quantities?
Length is how long something is. Weight (more precisely, mass) is how heavy it is. Volume is how much liquid fits in.
Each has small units (for tiny things) and big units (for big things):
| Quantity | Small unit | Big unit | Conversion |
| Length | cm | m | 1 m = 100 cm |
| Weight | g | kg | 1 kg = 1000 g |
| Volume | ml | l | 1 l = 1000 ml |
Notice — for weight and volume the multiplier is 1000; for length it's 100.
What you'll learn
- Length — cm and m, including conversions.
- Weight — g and kg.
- Volume — ml and l, plus comparing units.
- For parents — how to help at home.
Try it
- 📏 Length — cm ↔ m
- ⚖️ Weight — g ↔ kg
- 🥤 Volume — ml ↔ l
- 📐 Reading a ruler — measure lengths
- ⚖️ Compare measurements — mixed units
Summary
- Three quantities: length, weight, volume.
- Each has a small and a big unit: cm/m, g/kg, ml/l.
- 1 m = 100 cm, 1 kg = 1000 g, 1 l = 1000 ml.