Age 7 guide to measures

Quick answer

By the end of this page, you will understand how to measure length, weight, capacity, and time using standard units like metres, kilograms, litres, and hours.

Learning outcome

By the end of this page, you will be able to measure and compare everyday objects using standard units of length, weight, capacity, and time.

• You can use metres and centimetres to measure how long things are.
• You can use kilograms and grams to find out how heavy things are.
• You can use litres and millilitres to measure how much liquid is in containers.
• You can tell the time using hours and half-hours on an analogue clock.

Why this matters

Measuring things helps you understand the world around you. Whether you're helping in the kitchen, planning a trip, or playing sports, knowing how to measure helps you do things more accurately and safely.

For example, if you're making a cake, you need to measure the right amount of flour. If you're going on a walk, you need to know how far you've walked. If you're playing football, you need to know how long the game lasts. These are all important skills that help you in school and in real life!

How it works

Measuring is like using a special ruler or scale to find out how big, heavy, or full something is. Here’s how to do it:

1. Choose the right tool: Use a ruler for length, a scale for weight, a jug for capacity, and a clock for time.
2. Use the correct unit: For example, use centimetres for small things and metres for big things.
3. Measure carefully: Make sure you line up your tool correctly and read the numbers carefully.
4. Compare and record: See if one thing is longer, heavier, or holds more than another and write it down.

Examples you can see

Let's look at some examples you can see and touch:

Length: A pencil is about 18 centimetres long. A classroom is about 8 metres wide.

Weight: A bag of sugar weighs 1 kilogram. A pencil weighs about 5 grams.

Capacity: A water bottle holds 500 millilitres. A large jug holds 1 litre.

Time: A football match lasts 90 minutes. A movie is about 1 hour and 30 minutes long.

Try it as a mini adventure

Imagine you are a young explorer on a treasure hunt! You need to find clues hidden in different places around your house. Each clue tells you how far to walk, how much to collect, and how long you have to find it.

Here’s your treasure hunt:

1. Step 1: Walk 5 metres from the kitchen to the living room.
2. Step 2: Collect 300 grams of small stones.
3. Step 3: Pour 250 millilitres of water into a cup.
4. Step 4: Wait for 10 minutes to let the water cool.
5. Step 5: Draw a picture of your treasure and write how long it took you to find it.

When you finish, you’ll have practised measuring length, weight, capacity, and time!

Common mistakes

• Mistake: Using centimetres instead of metres for long distances.
  Why it happens: Not understanding the difference between small and large units.
  Fix: Remember that 100 centimetres = 1 metre. Use metres for things like the length of a room.
• Mistake: Confusing millilitres and litres.
  Why it happens: Both measure liquid, but millilitres are smaller.
  Fix: 1 litre = 1000 millilitres. Use litres for big amounts like a water bottle, millilitres for small amounts like a medicine cup.
• Mistake: Not lining up tools properly when measuring.
  Why it happens: Not paying attention to where the tool starts.
  Fix: Always start measuring from zero or the beginning of the ruler or scale.

Parent and carer guide

As a parent or carer, you can help your child by:

1. Using everyday activities to practice measuring, like cooking or walking.
2. Asking questions like, "How much does your toy weigh?" or "How long is your bed?"
3. Letting your child choose the right tool for the job (ruler, scale, jug).
4. Practising telling time with a clock or watch.
5. Encouraging your child to compare measurements (e.g., "Is this bottle bigger than that one?").

Remember: Mistakes are part of learning. If your child makes a mistake, gently guide them to the correct way. Don’t worry if they don’t get it right the first time!

Practice questions

1. How many centimetres are in 1 metre? Answer: 100 centimetres
2. If a bag of flour weighs 1 kilogram, how many grams is that? Answer: 1000 grams
3. How many millilitres are in 2 litres? Answer: 2000 millilitres
4. If a football match lasts 90 minutes, how many hours is that? Answer: 1 hour and 30 minutes
5. How many hours are in a day? Answer: 24 hours
6. If a pencil is 15 centimetres long, how many millimetres is that? Answer: 150 millimetres
7. How many grams are in half a kilogram? Answer: 500 grams
8. How many minutes are in 2 hours? Answer: 120 minutes
9. How many half-litres are in 1 litre? Answer: 2 half-litres
10. How many centimetres are in 3 metres? Answer: 300 centimetres

FAQ

What are the main units of measurement for length?

The main units are millimetres (mm), centimetres (cm), metres (m), and kilometres (km). Millimetres are very small, like the thickness of a coin. Centimetres are about the width of your thumb. Metres are for longer things, like the length of a room. Kilometres are for very long distances, like the distance between towns.

How do I know which unit to use?

Think about how big or small the object is. For example, a pencil is measured in centimetres, a swimming pool in metres, and the distance between cities in kilometres.

What’s the difference between grams and kilograms?

Grams are used for small things like a pencil or a cookie. Kilograms are used for heavier things like a bag of rice or a person. There are 1000 grams in 1 kilogram.

How do I read a clock?

An analogue clock has two hands: the short hand shows the hour, and the long hand shows the minutes. When the long hand points to 12, it's on the hour. When it points to 6, it's half past the hour.

Why do we need to measure things?

Measuring helps us be accurate and safe. It helps us know how much food to cook, how far we've walked, how long we've been doing something, and how much something weighs. It helps us solve problems and make better decisions in everyday life.