Length, Mass, Capacity and Time: Year 2 Study Guide
Year 2 children move from informal measurement to standard units, and to a wider range of times.
Children measure length with a ruler and a tape in centimetres (cm) and metres (m). They compare mass using balance scales and capacity using cups or jugs. They also tell time to the quarter hour, understand the 24 hours in a day and use a calendar.
On an analog clock, quarter past has the minute hand on 3, half past on 6 and quarter to on 9. These are a quarter of the way, half way and three-quarters of the way around the clock.
Using a ruler
Line up 0 with one end. The mark where the object stops is its length. A ruler has centimetres numbered and smaller millimetre marks. 100 cm = 1 m. If a plank is 2 m long, it is also 200 cm. Estimate first: a pencil is about 15 cm, a door is about 2 m high.
| Unit | Use | Example |
|---|---|---|
| Millimetre (mm) | Tiny lengths | Thickness of a coin |
| Centimetre (cm) | Small objects | A pencil is about 18 cm |
| Metre (m) | Rooms, people | A door is about 2 m |
| Kilometre (km) | Journeys | School is 2 km away |
Time on the clock
Hour hand: the short one, shows the hour. Minute hand: the long one. Quarter past 4: minute hand on 3, hour hand just past 4 (4:15). Half past 4: 4:30. Quarter to 5: minute hand on 9 (4:45). A day has 24 hours; 60 minutes make an hour and 7 days make a week.
On 3, 6 or 9?
Quarter past, half past, quarter to.
Which hour?
4:15.
Mass and capacity
A heavier object tips a balance scale down. Use blocks or cubes as informal units: 'The book has the same mass as 12 cubes'. For capacity, count how many cups fill a jug. Always use the same unit when comparing.
Worked examples and common mistakes
Example: A rope is 150 cm. That is 1 m 50 cm. Example: The minute hand is on 9 and the hour hand is near 7. It is quarter to 8 (7:45). Common mistakes: measuring from the end of the ruler, mixing up the hands and thinking 'quarter to 8' is 8:15. Use a clock with moveable hands.
Check your understanding: model answers
1. 300 cm. 2. Quarter to 4 (3:45). 3. The pencil case (11 cubes is more than 8).
✨ Key Takeaways
- Use cm and m for length.
- Quarter past: 3; half past: 6; quarter to: 9.
- Compare mass with a balance and capacity by pouring.
- Always start measuring from zero.
💬 Questions for Discussion & Reflection
- How many centimetres are in 3 m?
- What time is it when the minute hand is on 9 and the hour hand is near 3?
- A book has the mass of 8 cubes and a pencil case 11 cubes. Which is heavier?
Print graph paper for measuring →