Let’s go through each problem one by one and pick the best estimate for length or height.
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1. The height of a Ferris wheel
Ferris wheels are tall — like big amusement park rides.
- 7 m? Too short (about 2 stories).
- 7,000 m? That’s 7 km — way too tall (higher than mountains!).
- 70 m? Reasonable — many real Ferris wheels are around 50–100 m.
- 1 km? Way too tall.
✔ Best:
C) 70 m
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2. The length of a carrot
Carrots are veggies you hold in your hand.
- 15 cm? About 6 inches — perfect for a medium carrot.
- 15 mm? Only 1.5 cm — too tiny.
- 0.5 m? Half a meter — that’s huge for a carrot!
- 150 cm? 1.5 meters — no way!
✔ Best:
A) 15 cm
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3. The length of a crayon
Crayons fit in your hand.
- 900 mm = 90 cm — almost a meter? No.
- 9 mm — less than 1 cm? Too small.
- 90 cm — again, too long.
- 90 mm = 9 cm — yes! Standard crayon is about 8–10 cm.
✔ Best:
D) 90 mm
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4. The length of a rattlesnake
Rattlesnakes can be long, but not super long.
- 15 cm? Too short — that’s like a ruler.
- 1.5 m? About 5 feet — reasonable for a large snake.
- 1.5 km? Impossible.
- 15 m? Longer than a bus — nope.
✔ Best:
B) 1.5 m
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5. The height of a sunflower
Sunflowers grow tall — sometimes over your head.
- 240 mm = 24 cm — too short.
- 240 cm = 2.4 m — possible for giant sunflowers!
- 24 m? Taller than a house — no.
- 2.4 km? Ridiculous.
Wait — let’s check: 240 cm = 2.4 meters. Some sunflowers do reach that! But is it common? Actually, average sunflowers are 1.5–3 m, so 2.4 m is plausible.
But look at options:
A) 240 mm → 24 cm — too small
B) 240 cm → 2.4 m — good
C) 24 m — too big
D) 2.4 km — nonsense
✔ Best:
B) 240 cm
*(Note: If this were a typical garden sunflower, maybe 1.5 m, but since 240 cm is an option and others are way off, we pick B.)*
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6. The length of a fire truck
Fire trucks are big vehicles.
- 0.95 km = 950 m — way too long.
- 950 mm = 0.95 m — shorter than a person — no.
- 95 m — longer than a football field — no.
- 9.5 m — about 30 feet — perfect for a fire truck.
✔ Best:
D) 9.5 m
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7. The length of the Titanic
The Titanic was a huge ship.
Historical fact: RMS Titanic was about 269 meters long.
Options:
- A) 1 km = 1000 m — too long
- B) 5,000 m — way too long
- C) 270 m — very close to actual 269 m
✔
- D) 5,000 mm = 5 m — tiny boat — no
✔ Best:
C) 270 m
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8. The height of a 2-story house
Each story is about 3 meters high. So 2 stories ≈ 6 meters.
Convert to cm: 6 m = 600 cm
Options:
- A) 600 cm → 6 m — perfect
- B) 60 m — 20 stories — no
- C) 600 mm = 0.6 m — knee-high — no
- D) 0.6 m — same as above — no
✔ Best:
A) 600 cm
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Final Answer:
1. C) 70 m
2. A) 15 cm
3. D) 90 mm
4. B) 1.5 m
5. B) 240 cm
6. D) 9.5 m
7. C) 270 m
8. A) 600 cm
Parent Tip: Review the logic above to help your child master the concept of metric system worksheets.
