Mass

14 Grade 3 Mathematics questions on Mass, with worked marking schemes. 14 questions are available on this topic in full.

1. Question 1

   1 mark

   Which is heavier: 1,500 g or 1 kg 600 g?

   (1 mark)

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2. Question 2

   1 mark

   How many grams are in 6 kilograms?

   (1 mark)

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3. Question 3

   2 marks

   Wanjiku buys a watermelon of mass $3$ kg and a pawpaw of mass $2$ kg. What is the total mass of the two fruits?

   (2 marks)

   Marking scheme

   Add the two masses: $3\text{ kg}+2\text{ kg}=5\text{ kg}$. The total mass is $5$ kg.

4. Question 4

   2 marks

   Multiply: 500 g × 4 = ___

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5. Question 5

   2 marks

   A baby weighed 3 kg 400 g at birth. After one month the baby gained 600 g. What is the new mass?

   (2 marks)

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6. Question 6

   3 marks

   A butcher has a piece of meat weighing 3 kg 600 g. He cuts off 1 kg 250 g. How much is left?

   (3 marks)

   Marking scheme

   Work in grams throughout, since $1$ kg $=1,000$ g. The meat is $3$ kg $600$ g $=3,600$ g. (1)

   The piece cut off is $1$ kg $250$ g $=1,250$ g, and "how much is left" means subtract: $3,600-1,250=2,350$ g. (1)

   Change back to kilograms and grams: $2,350$ g $=2$ kg $350$ g. (1)

   Final answer: $2$ kg $350$ g.

7. Question 7

   3 marks

   Three parcels weigh 1 kg 200 g, 800 g, and 2 kg 100 g. Find their total mass.

   (3 marks)

   Marking scheme

   Change every mass to grams first, since $1$ kg $=1,000$ g: $1$ kg $200$ g $=1,200$ g and $2$ kg $100$ g $=2,100$ g. (1)

   "Total mass" means add them: $1,200+800+2,100=4,100$ g. (1)

   Change back to kilograms and grams: $4,100$ g $=4$ kg $100$ g. (1)

   Final answer: $4$ kg $100$ g.

8. Question 8

   1 mark

   A packet of sugar has a mass of $2$ kg. What is its mass in grams? (Remember $1$ kg $=1000$ g)

   A. $20000$ g

   B. $2000$ g

   C. $20$ g

   D. $200$ g

   (1 mark)

   Marking scheme

   B. $2,000$ g — $1$ kg is $1,000$ g, so multiply: $2\times 1,000=2,000$. Multiplying by $10,000$ or by $100$ gives the other options.

9. Question 9

   1 mark

   Convert 3,250 g to kilograms and grams.

   (1 mark)

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10. Question 10

    2 marks

    Subtract: 5 kg 300 g − 2 kg 800 g = ___

    (2 marks)

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11. Question 11

    1 mark

    A school bag weighs 3 kg. How many grams is that?

    (1 mark)

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12. Question 12

    2 marks

    Add: 2 kg 600 g + 1 kg 750 g = ___

    (2 marks)

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13. Question 13

    1 mark

    Convert 4 kg 500 g to grams.

    (1 mark)

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14. Question 14

    1 mark

    A bag of flour weighs 2 kg 400 g. What is its mass in grams?

    (1 mark)

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