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We use mm to measure the length or height of small things, cm for larger things, metres for very large things and km for long distances.

Year 2 Measurements - Estimating

Estimating length is a handy first step. Make a sensible guess using number lines, then measure to check and improve accuracy.

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Fascinating Fact:

Length line. Point on a number line. If 18 cm sits between 10 and 20, say “about 20 cm”. Then measure.

In KS1 Maths, pupils estimate measurements before checking them. Using benchmarks and number lines helps children make sensible guesses, then a ruler or tape measure confirms the exact length.

Key Terms

Estimate: A sensible guess based on what you already know.
Number line: A straight line marked with numbers to help compare sizes.
Reasonableness check: A quick test to see if your answer makes sense.

Frequently Asked Questions (Click to see answers)

How do you estimate length in KS1?

Start by thinking of a known size, like a 10 cm ruler. Place the object on a number line in your mind, make a sensible guess, then measure to check.

What is a number line used for in measuring?

A number line helps you see where a length might fit between two markers, such as between 10 cm and 20 cm, so you can estimate quickly.

How do I check if my estimate is reasonable?

Compare with a benchmark, then measure accurately. If your estimate is close to the measured value, it was reasonable; if not, adjust next time.

Try These Related Quizzes

To see a larger image, click on the picture.

Question 1

How long could your hand be?

12cm

12mm

12m

12km

Smaller items are usually measured in centimetres

Question 2

What could be the temperature in this photograph?

80mm

80ml

80km

80^oC

Degrees measure temperatures. 80^oC is very hot!

Question 3

What could this item be used to measure?

A large bunch of bananas

The water in a bath

The distance to the moon

The height of a cat

These are kitchen scales and are usually used to weigh items of food

Question 4

How much might this puppy weigh?

5^oC

5km

5kg

Kilograms would be the best unit to use here

Question 5

How much liquid could a coffee cup hold?

250g

250cm

250ml

250kg

Millilitres are used to measure smaller amounts of liquid

Question 6

What unit of measurement would be most appropriate to measure the length of this pitch?

Degrees

Kilograms

Millilitres

Metres

Metres would be easier than centimetres!

Question 7

What could the temperature be in this fridge?

2mm

2^oC

2kg

Temperatures are measured in degrees

Question 8

How much lemonade might this jug hold?

2 metres

2 litres

2 millimetres

2 kilograms

Litres are used for liquid

Question 9

How tall might this man be?

1m 80cm

18cm

1km 8m

12m

Most adults are taller than 1 metre but less than 2 metres

Question 10

What unit of measure would be best to measure the ribbon around the parcel?

Metres

Centimetres

Millimetres

Miles

Centimetres would be easier to use for shorter measurements

Author: Angela Smith (Primary School Teacher & KS1 Quiz Writer)

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