Grade 3 Maths Worksheets: (12.7 Word Problems on Grams and ... - Free Printable

Let's solve each word problem step by step and explain the solution clearly.

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Problem 1:

Ali has 450 kg of wheat in his shop which he wants to sell. He sold 243 kg of wheat today. How much wheat is left that needs to be sold now?

Solution:
We need to subtract the amount sold from the total amount.

$$
450\, \text{kg} - 243\, \text{kg} = 207\, \text{kg}
$$

✔ Answer: 207 kg of wheat is left to be sold.

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Problem 2:

A pencil weighs 25g, an eraser weighs 30g, a ruler weighs 15g, a pack of markers weighs 490g, and a pencil case weighs 710g. What is the total weight of all the things?

Solution:
Add all the weights together:

$$
25 + 30 + 15 + 490 + 710 = ?
$$

Step-by-step:
- $25 + 30 = 55$
- $55 + 15 = 70$
- $70 + 490 = 560$
- $560 + 710 = 1270$

✔ Answer: The total weight is 1270 grams.

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Problem 3:

The weight of a goat is 40kg 340g. What is the total weight of 3 goats of the same weight?

Solution:
First, convert the weight into a single unit (grams or kilograms). Let's use grams for accuracy.

- 40 kg = 40,000 g
- So, 40 kg 340 g = 40,000 + 340 = 40,340 grams

Now multiply by 3:

$$
40,340 \times 3 = 121,020\, \text{grams}
$$

Convert back to kg and grams:
- 121,020 g = 121 kg 20 g (since 1000 g = 1 kg)

✔ Answer: The total weight of 3 goats is 121 kg 20 g.

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Problem 4:

Emma is 16 kg heavier than her brother who weighs 87 kg. What is the weight of Emma?

Solution:
Add 16 kg to her brother’s weight:

$$
87\, \text{kg} + 16\, \text{kg} = 103\, \text{kg}
$$

✔ Answer: Emma weighs 103 kg.

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Problem 5:

A bowl weighs 1 kg. When I completely filled it with sand, it then weighed 850g. How much sand did I put in the bowl?

Solution:
Wait — this seems tricky. Let's check units carefully.

- Bowl weight = 1 kg = 1000 grams
- Total weight (bowl + sand) = 850 grams

But this can't be right! The bowl alone is 1000g, but the total is only 850g? That would mean the sand weighs negative, which is impossible.

So there must be a mistake in the question or our interpretation.

Wait — perhaps it's a typo?

Let’s assume the total weight is 850g, and the bowl is 1kg = 1000g → that would make no sense.

Alternatively, maybe the bowl weighs 1 kg, and when filled, it weighs 850g more? But the sentence says "it then weighed 850g".

Let’s re-read:
> "A bowl weighs 1kg. When I completely filled it with sand, it then weighed 850g."

This implies:
- Bowl: 1000g
- Bowl + Sand: 850g → Impossible (sand would be negative)

✘ So likely, the total weight is not 850g, but 850g is the sand? Or maybe the bowl is 100g?

Wait — let’s suppose the bowl weighs 100g (not 1kg), and total is 850g?

But the problem says: “A bowl weighs 1kg”

Alternatively, maybe the total weight is 850g, but that contradicts the bowl being 1kg.

Unless... the bowl weighs 100g, and “1kg” is a typo?

But let’s consider: Maybe the total weight is 850g, and the bowl is 100g? Then:

Sand = 850g - 100g = 750g

But the problem says bowl weighs 1kg = 1000g, so:

Total weight = 850g
Bowl = 1000g → Impossible

So either:
- The bowl weighs 100g, or
- The total weight is 1850g, or
- There’s a typo.

But assuming the problem meant:
> "A bowl weighs 100g. When I filled it with sand, it weighed 850g."

Then:
$$
\text{Sand} = 850\, \text{g} - 100\, \text{g} = 750\, \text{g}
$$

Or if the bowl is 1kg = 1000g, and total is 1850g, then:
$$
\text{Sand} = 1850 - 1000 = 850\, \text{g}
$$

But as written: “weighed 850g” after filling — which is less than the bowl's weight.

Therefore, this problem has an error.

But wait — maybe the bowl weighs 100g, and “1kg” is a typo? Or perhaps “1kg” is correct, but the total is 1.850kg?

Let’s try interpreting:

Suppose the bowl weighs 1kg, and when filled, it weighs 1.850kg → then:

$$
\text{Sand} = 1.850\, \text{kg} - 1\, \text{kg} = 0.850\, \text{kg} = 850\, \text{g}
$$

That makes sense.

So likely, the problem meant:
> "When I completely filled it with sand, it then weighed 1.850 kg"
or
> "…it then weighed 850g more"

But as written: "it then weighed 850g" — that can’t be.

✔ Most plausible correction: The total weight is 1.850 kg (or 1850g), so:

$$
\text{Sand} = 1850\, \text{g} - 1000\, \text{g} = 850\, \text{g}
$$

✔ Answer (assuming typo): 850 grams of sand.

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✔ Final Answers:

1. 207 kg
2. 1270 g
3. 121 kg 20 g
4. 103 kg
5. 850 g (assuming total weight is 1.850 kg or 1850g; otherwise, the problem has an inconsistency)

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