SEAGReady
MeasurementP6 level21 questions in the full course

Convert Length UnitsSEAG Practice Questions

Converting between kilometres, metres, centimetres, and millimetres using multiplication and division by 10, 100, and 1000.

Where your child meets this in real life: Converting height from centimetres to metres (e.g., 175 cm = 1.75 m)

What your child needs to know

SEAGReady breaks convert length units into 3 steps, taught in order so each skill builds on the last.

  1. 1

    Metres and Centimetres

    Convert between metres and centimetres using multiplication by 100 and division by 100

  2. 2

    Centimetres and Millimetres

    Convert between centimetres and millimetres using multiplication by 10 and division by 10

  3. 3

    Kilometres and Metres

    Convert between kilometres and metres using multiplication by 1000 and division by 1000

Try these SEAG-style questions

Three free sample questions from our convert length units course. Every question comes with a full explanation, and hints that guide without giving the answer away.

Question 1Confidence builder

Lewis's living-room length is shown. How many centimetres is this?

A conversion flow shows a room length of 3 metres leading to an unknown number of centimetres.
Answer choices for question 1
Question 2Confidence builder

The beetle's length is shown. How many centimetres is this?

A conversion flow shows a beetle length of 20 millimetres leading to an unknown number of centimetres.
Answer choices for question 2
Question 3Standard

Conor ran 4000 metres in a charity race. How many kilometres is this?

Answer choices for question 3

Try the lesson: Metres and Centimetres

This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.

Abigail is measuring her bedroom for new carpet. The room is 4 metres long.

How many centimetres is this?

4 m = ? cm

Recall the conversion factor
1

Centi means one hundredth, so 100 cm = 1 m

Step 1 of 4

Prefer to read? See every step written out

Abigail is measuring her bedroom for new carpet. The room is 4 metres long.

How many centimetres is this?

  1. 1

    Recall the conversion factor

    • Centi means one hundredth, so 100 cm = 1 m
  2. 2

    Multiply to convert to smaller units

    • Smaller units need a bigger number
    • Multiply by 1004 × 100 = 400
  3. 3

    Write the answer with units

    • The room is 400 cm long

Abigail's bedroom is 400 cm long.

The key insight: When converting to smaller units, the number gets bigger - more little pieces fit!

Common mix-up: 4 m = 4 cm (dividing instead of multiplying). Centimetres are smaller than metres, so you need MORE of them, not fewer.

Mistakes to watch for

These are the misconceptions we see most often in convert length units, including the ones our practice questions are specifically designed to catch.

  • Multiplying when converting to larger units (e.g., cm to m)
  • Forgetting there are 100 cm in a metre but 1000 m in a kilometre

Build these skills first

Struggling with convert length units? The real gap is often in one of these earlier topics.

Understand Metric Prefixes

More measurement practice

Know Metric Unit NamesConvert Mass UnitsConvert Capacity UnitsConvert Units with DecimalsChoose Appropriate UnitsRead Positive Temperatures
21 questions on this topic alone

Master convert length units and everything it unlocks

SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.

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