Selecting the most appropriate metric unit for measuring different objects and distances (e.g., a football pitch in metres, not centimetres).
Where your child meets this in real life: Deciding what measuring tool to use, understanding appropriate precision for different tasks
SEAGReady breaks choose appropriate units into 2 steps, taught in order so each skill builds on the last.
Select appropriate length units (cm, m, km) for measuring everyday objects and distances
Select appropriate units for measuring different attributes: length (cm, m, km), mass (g, kg), and capacity (ml, l)
Three free sample questions from our choose appropriate units course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Emma wants to measure the length of her school hall for a maths project. Should she measure it in centimetres, metres, or kilometres?
Answer: A. metres
A school hall is about 20-30 big strides long. Metres are the sensible choice because: - Centimetres would give a huge number (2000+ cm) - Kilometres are for distances between towns Answer: metres
Stuck? Start here: Think about how long the school hall is - can you walk across it in a few steps or does it take a long time?
Ciara is baking scones and needs to weigh flour. The recipe says she needs 200 of flour. Which unit makes sense: grams, metres, or millilitres?
Answer: A. grams
Flour has mass (weight), so we need grams or kilograms. 200 grams is a sensible baking amount. - Metres measure length, not weight - Millilitres measure liquids, not solids Answer: grams
Stuck? Start here: What are you measuring? Is flour a length, a weight, or a liquid?
Conor is measuring the length of his pencil. Which unit should he use?
Answer: A. centimetres
A pencil is a small object, about 15-20 cm long. Centimetres are the sensible choice because: - A pencil is much shorter than 1 metre - Kilometres are far too big - Litres measure liquids, not length Answer: centimetres
Stuck? Start here: A pencil fits in your hand. Is it longer than your arm?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Oisin wants to measure the length of the school football pitch for a PE project.
Should he measure it in centimetres, metres, or kilometres?
Pitch length: cm, m, or km?
Step 1 of 5
Oisin wants to measure the length of the school football pitch for a PE project.
Should he measure it in centimetres, metres, or kilometres?
Oisin should measure the pitch in metres. It would be about 100 metres long.
The key insight: Choose a unit that gives you a sensible number - not too big, not too small!
Watch out: Measure the pitch in centimetres (10,000 cm). 10,000 is hard to picture. Using metres (100 m) is much easier to understand and work with.
These are the misconceptions we see most often in choose appropriate units, including the ones our practice questions are specifically designed to catch.
Struggling with choose appropriate units? The real gap is often in one of these earlier topics.
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.