Year 5 Maths: Converting Units of Mass

Introduction to Mass

Hello Year 5! Today, we are going to learn about converting units of mass. Mass is how heavy something is. We often use different units to measure mass, like grams (g) and kilograms (kg).

Key Units of Mass

1. Gram (g) – A small unit of mass.
2. Kilogram (kg) – A larger unit of mass.
3. Ton (t) – An even bigger unit of mass.

Understanding the Relationship Between Units

Here’s a simple way to remember how these units relate to each other:

• 1 kilogram (kg) = 1,000 grams (g)
• 1 ton (t) = 1,000 kilograms (kg)

Converting Units of Mass

Now, let’s learn how to convert between these units!

From Kilograms to Grams

To convert kilograms to grams, you multiply by 1,000.

Example:

If you have 2 kg and want to change it to grams:

$$

2 \text{ kg} \times 1000 = 2000 \text{ g}

$$

So, 2 kg is the same as 2000 g!

From Grams to Kilograms

To convert grams to kilograms, you divide by 1,000.

Example:

If you have 5000 g and want to change it to kilograms:

$$

5000 \text{ g} \div 1000 = 5 \text{ kg}

$$

So, 5000 g is the same as 5 kg!

From Tonnes to Kilograms

To convert tonnes to kilograms, you also multiply by 1,000.

Example:

If you have 3 t and want to change it to kilograms:

$$

3 \text{ t} \times 1000 = 3000 \text{ kg}

$$

So, 3 t is the same as 3000 kg!

From Kilograms to Tonnes

To convert kilograms to tonnes, you divide by 1,000.

Example:

If you have 2500 kg and want to change it to tonnes:

$$

2500 \text{ kg} \div 1000 = 2.5 \text{ t}

$$

So, 2500 kg is the same as 2.5 t!

Key Rules to Remember

1. Kilograms to Grams: Multiply by 1,000.
2. Grams to Kilograms: Divide by 1,000.
3. Tonnes to Kilograms: Multiply by 1,000.
4. Kilograms to Tonnes: Divide by 1,000.

Tips and Tricks

• Remember the “kilo” prefix means 1,000. It helps you remember multiplication and division.
• Use a chart to visually see the relationships. Sometimes drawing it out can make it easier to remember!
• Practice with real-life examples, like measuring ingredients when cooking.

Questions

Easy Level Questions

1. How many grams are in 1 kilogram?
2. Convert 1 kg to grams.
3. If you have 500 g, how many kg do you have?
4. Convert 2 kg to grams.
5. If you have 3 kg, how many grams is that?
6. How many kilograms are in 2,000 grams?
7. Convert 1.5 kg to grams.
8. If you have 250 g, how many kg do you have?
9. Convert 4 kg to grams.
10. How many grams are in 3.5 kg?
11. Convert 1000 g to kg.
12. How many kg is 1500 g?
13. Convert 0.5 kg to grams.
14. If you have 800 g, how many kg do you have?
15. Convert 5 kg to grams.
16. How many grams are in 0.1 kg?
17. Convert 3000 g to kg.
18. If you have 600 g, how many kg do you have?
19. Convert 2.5 kg to grams.
20. How many grams are in 1.2 kg?

Medium Level Questions

1. Convert 3 kg to grams and then back to kg.
2. If you have 2.5 kg, how many grams do you have?
3. Convert 1500 g to kg.
4. How many kg are in 4,500 grams?
5. Convert 0.25 kg to grams.
6. If you have 3,200 g, how many kg do you have?
7. Convert 5.5 kg to grams.
8. How many grams are in 0.75 kg?
9. Convert 7 kg to grams.
10. If you have 2,200 g, how many kg do you have?
11. Convert 1.8 kg to grams.
12. How many kg are in 1,500 grams?
13. Convert 6,000 g to kg.
14. If you have 0.9 kg, how many grams do you have?
15. Convert 4.2 kg to grams.
16. How many grams are in 3.7 kg?
17. Convert 8,500 g to kg.
18. If you have 1,800 g, how many kg do you have?
19. Convert 2.2 kg to grams.
20. How many kg are in 9,000 grams?

Hard Level Questions

1. A bag weighs 3.5 kg. How many grams does it weigh?
2. If you have 1,250 g of flour, how many kg do you have?
3. Convert 10 kg to grams and back to kg.
4. How many grams are in 4.75 kg?
5. A box weighs 2,300 g. What is its weight in kg?
6. Convert 0.125 kg to grams.
7. If you have 5,500 g, how many kg do you have?
8. Convert 2.75 kg to grams.
9. How many grams are in 0.05 kg?
10. A suitcase weighs 7.2 kg. How many grams is that?
11. Convert 1,200 g to kg.
12. How many kg are in 11,000 grams?
13. Convert 3.6 kg to grams.
14. If you have 4,800 g, how many kg do you have?
15. Convert 5.25 kg to grams.
16. How many grams are in 2.95 kg?
17. Convert 6,500 g to kg.
18. If you have 1,400 g, how many kg do you have?
19. Convert 0.6 kg to grams.
20. How many kg are in 15,000 grams?

Answers

Easy Level Answers

1. 1,000 grams.
2. 1,000 g.
3. 0.5 kg.
4. 2,000 g.
5. 3,000 g.
6. 2 kg.
7. 1,500 g.
8. 0.25 kg.
9. 4,000 g.
10. 3,500 g.
11. 1 kg.
12. 1.5 kg.
13. 500 g.
14. 0.8 kg.
15. 5,000 g.
16. 100 g.
17. 3 kg.
18. 0.6 kg.
19. 2,500 g.
20. 1,200 g.

Medium Level Answers

1. 3,000 g; 3 kg.
2. 2,500 g.
3. 1.5 kg.
4. 4.5 kg.
5. 250 g.
6. 3.2 kg.
7. 5,500 g.
8. 750 g.
9. 7,000 g.
10. 2.2 kg.
11. 1,800 g.
12. 1.5 kg.
13. 6 kg.
14. 0.9 kg.
15. 4,200 g.
16. 3,700 g.
17. 8.5 kg.
18. 1.8 kg.
19. 2,200 g.
20. 9 kg.

Hard Level Answers

1. 3,500 g.
2. 1.25 kg.
3. 10,000 g; 10 kg.
4. 4,750 g.
5. 2.3 kg.
6. 125 g.
7. 5.5 kg.
8. 2,750 g.
9. 50 g.
10. 7,200 g.
11. 1.2 kg.
12. 11 kg.
13. 3,600 g.
14. 4.8 kg.
15. 5,250 g.
16. 2,950 g.
17. 6.5 kg.
18. 1.4 kg.
19. 600 g.
20. 15 kg.