Choose and use appropriate standard units to estimate and measure ... - Free Printable

Let’s go step by step to solve this problem.

We are being asked to match real-life objects or measurements with the correct unit of length: mm (millimeters), cm (centimeters), m (meters), or km (kilometers).

First, let’s remember what each unit is used for:

- mm – very small things, like the thickness of a coin or width of a keyhole.
- cm – small everyday items, like a pencil or a teacup.
- m – medium-sized things, like a person’s height, a school building, or a football field.
- km – very long distances, like between cities, or the length of a railway or park.

Now let’s look at each item and decide which unit fits best.

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Left column:

1. The length of a pencil → A pencil is about 15–20 cm long → cm
2. The length of a park → Parks can be hundreds of meters or even kilometers long → km
3. The height of a school → Schools are usually 2–4 stories tall → around 10–15 meters → m
4. The width of a football field → Standard soccer fields are about 70 meters wide → m

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Right column:

5. The height of a table → Tables are about 70–80 cm high → cm
6. The length of a railway → Railways go between towns/cities → very long → km
7. The width of a keyhole → Very tiny! Maybe 5–10 mm → mm
8. The height of a teacup → About 8–10 cm → cm

Wait — we have two items that might fit “cm”: pencil, table, teacup. That’s okay — multiple items can use the same unit.

But let’s check if we’ve covered all units:

- mm → only keyhole so far → good
- cm → pencil, table, teacup → that’s fine
- m → school, football field → good
- km → park, railway → good

Actually, looking again — “the height of a table” was cut off in the image? But based on common sense, it’s likely “table”.

Also, note: “The length of a park” — could be argued as meters if it’s a small park, but generally parks are measured in km when talking about their full length. Same with railway — definitely km.

Let’s double-check:

- Keyhole width → mm ✔
- Pencil → cm ✔
- Teacup height → cm ✔
- Table height → cm ✔
- School height → m ✔
- Football field width → m ✔
- Park length → km ✔
- Railway length → km ✔

Perfect — all units are used appropriately.

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Final Answer:

mm: The width of a keyhole
cm: The length of a pencil, The height of a table, The height of a teacup
m: The height of a school, The width of a football field
km: The length of a park, The length of a railway