Let’s go through each question one by one and think about what makes sense for the size of each object.
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Question 1: Which one is 5 mm long?
- An ant → Ants are tiny. About 5 mm sounds right.
- Your arm → Way too big — that’s more like 50 cm or even longer.
- A bus → Huge! That’s many meters long.
✔ So,
an ant is about 5 mm long.
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Question 2: Which one is 15 cm long?
- A football pitch → That’s huge — over 100 meters!
- A mobile phone → Most phones are around 14–16 cm long. Perfect!
- A dog → Even a small dog is bigger than 15 cm — maybe 30–50 cm tall at least.
✔ So,
a mobile phone is about 15 cm long.
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Question 3: Which one is 20 m long?
- A tennis court → A standard tennis court is about 23.77 meters long — close to 20 m. Good fit.
- A toothbrush → Only about 15–20 cm long — way too short.
- A car → Usually 4–5 meters long — not 20 m.
✔ So,
a tennis court is about 20 m long.
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Question 4: How would you measure...?
We need to pick the best unit: mm (millimeters), cm (centimeters), or m (meters).
Remember:
-
mm = very small things (like screws, ants)
-
cm = medium-sized things (pencils, books, babies)
-
m = big things (people, houses, giraffes)
Now let’s match:
a)
A giraffe? → Very tall animal → use
m
b)
A pencil? → Fits in your hand → use
cm
c)
A house? → Big building → use
m
d)
Your height? → You’re probably between 1–2 meters → use
m
e)
A cereal box? → Like a shoebox size → use
cm
f)
A screw? → Tiny metal piece → use
mm
g)
A newborn baby? → Small but still measured in centimeters (about 50 cm) → use
cm
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Final Answer:
1) An ant
2) A mobile phone
3) A tennis court
4)
a) m
b) cm
c) m
d) m
e) cm
f) mm
g) cm
Parent Tip: Review the logic above to help your child master the concept of appropriate unit of measurement worksheet.
