Measuring Weight (Kilograms and Grams) Worksheets - Free Printable

Let's solve the problem step by step.

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Understanding the Task

The worksheet is about estimating weight using grams (g) and kilograms (kg). It asks you to choose the best estimate for the weight of each object or animal shown.

We are given:
- A gram (g) is used for very light objects (e.g., a popcorn kernel ≈ 1 gram).
- A kilogram (kg) is used for heavier objects (e.g., a one-liter bottle of water ≈ 1 kilogram).

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Guidelines for Estimation:

- Grams (g): Light items like food, small animals, feathers.
- Kilograms (kg): Heavier items like pets, shoes, large animals.

Remember:
- 1 kilogram = 1000 grams

Now let’s go through each item:

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1. Carrot

- Options:
- 18 grams
- 4 kilograms
- 8 kilograms

✔ Best estimate: 18 grams
👉 A carrot is light — not even a kilogram. 18 grams is reasonable.

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2. Football

- Options:
- 20 grams
- 300 grams
- 500 grams

✔ Best estimate: 300 grams
👉 A football weighs more than a few grams but less than a kilogram. Around 300–400 grams is typical.

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3. Pig

- Options:
- 900 grams
- 9 kilograms
- 90 kilograms

✔ Best estimate: 90 kilograms
👉 A small pig can weigh around 90 kg. 900 grams is only 0.9 kg — too light. 9 kg is still too small.

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4. Ice Skate

- Options:
- 160 grams
- 18 kilograms
- 3 kilograms

✔ Best estimate: 3 kilograms
👉 A single ice skate weighs about 1–3 kg. 160 grams is too light (like a bag of sugar). 18 kg is way too heavy.

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5. Cat

- Options:
- 250 grams
- 7 kilograms
- 57 kilograms

✔ Best estimate: 7 kilograms
👉 Average house cat weighs 4–5 kg; 7 kg is realistic. 250 grams is like a baby bird. 57 kg is a large dog or bear.

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6. Frog

- Options:
- 2 grams
- 300 grams
- 3 kilograms

✔ Best estimate: 2 grams
👉 Small frogs weigh just a few grams. 300 grams is a big frog (like a bullfrog), but 2 grams is more typical for a small one.

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7. Book

- Options:
- 100 grams
- 1 kilogram
- 100 kilograms

✔ Best estimate: 1 kilogram
👉 A thick textbook might be 1 kg. 100 grams is very light (like a smartphone). 100 kg is absurd.

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8. Feather

- Options:
- 1 gram
- 20 grams
- 1 kilogram

✔ Best estimate: 1 gram
👉 A feather is very light — likely under 1 gram, but 1 gram is a good estimate.

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9. Camel

- Options:
- 100 kilograms
- 40,000 grams
- 6,000 grams

✔ Best estimate: 40,000 grams
Wait! Let’s convert:
- 40,000 grams = 40 kg → still too light for a camel.
- 6,000 grams = 6 kg → nope.
- But wait — maybe there's a typo? Let's check.

Actually:
- 40,000 grams = 40 kg
- A camel weighs about 400–600 kg, so none of these options seem right.

But wait — let's recheck the choices:
- 100 kg = 100,000 grams
- 40,000 grams = 40 kg
- 6,000 grams = 6 kg

None of these are close to a camel's actual weight (~400–600 kg). But among them, 40,000 grams = 40 kg is the closest — though still low.

But perhaps it's a baby camel?

Still, if we assume this is a young camel, 40 kg is possible.

Alternatively, maybe the intended answer is 40,000 grams, assuming it's a typo in the question.

But wait — 40,000 grams = 40 kg, which is still too light.

Wait — perhaps the option should be 400,000 grams?

But as written, the best choice among the given ones is:

✔ 40,000 grams (40 kg) — though still low, it's the largest option and most reasonable.

But let’s double-check:
- 100 kilograms = 100,000 grams
- 40,000 grams = 40 kg
- 6,000 grams = 6 kg

So 100 kilograms is 100,000 grams, which is not listed, but 100 kilograms is an option.

Wait — look again at the choices:

> 100 kilograms
> 40,000 grams
> 6,000 grams

Ah! So "100 kilograms" is a choice.

That’s better!

But the option says "100 kilograms", which is 100,000 grams — much closer to a camel’s weight.

So the correct choice is:

✔ 100 kilograms

Because:
- A camel weighs over 400 kg, but 100 kg is still low — but among the choices, it's the only one that makes sense.
- 40,000 grams = 40 kg — too light
- 6,000 grams = 6 kg — no
- 100 kilograms = 100 kg — still under, but best available

Wait — is there a mistake?

Let’s reconsider: Maybe it's a very young camel?

Or perhaps the question meant a small camel?

But realistically, even a newborn camel weighs ~40–50 kg.

So 100 kg is plausible for a small adult camel or large calf.

But 40,000 grams = 40 kg — that’s also possible.

Wait — which is larger?
- 100 kilograms = 100,000 grams
- 40,000 grams = 40 kg
- So 100 kilograms is larger and better estimate than 40 kg.

So among the choices:
- 100 kilograms → best
- 40,000 grams = 40 kg → smaller
- 6,000 grams = 6 kg → too small

✔ So 100 kilograms is the best estimate from the list.

Even though real camels are heavier, 100 kg is the closest among the given choices.

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✔ Final Answers:

| # | Object/Animal | Best Estimate |
|---|----------------|---------------|
| 1 | Carrot | 18 grams |
| 2 | Football | 300 grams |
| 3 | Pig | 90 kilograms |
| 4 | Ice Skate | 3 kilograms |
| 5 | Cat | 7 kilograms |
| 6 | Frog | 2 grams |
| 7 | Book | 1 kilogram |
| 8 | Feather | 1 gram |
| 9 | Camel | 100 kilograms |

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✔ Summary:

Use grams for small/light things (feather, frog, carrot, book).
Use kilograms for larger/heavier things (pig, cat, camel, shoe, football).

Always compare to known weights:
- Popcorn kernel = 1 g
- Water bottle = 1 kg

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✔ Answer Key:
1. 18 grams
2. 300 grams
3. 90 kilograms
4. 3 kilograms
5. 7 kilograms
6. 2 grams
7. 1 kilogram
8. 1 gram
9. 100 kilograms

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