Year 5 Maths: Converting Units of Weight

Hello, Year 5! Today, we’re going to learn about converting units of weight. This means changing a weight from one unit to another. For example, you might need to know how many grams are in a kilogram or how many ounces are in a pound. Let’s dive into it!

What are Units of Weight?

Before we start converting, let’s understand the units of weight we will be using. Here are some common ones:

• Grams (g): A small unit of weight.
• Kilograms (kg): 1 kilogram is equal to 1,000 grams. This is a larger unit used for heavier items.
• Pounds (lbs): Used mainly in the UK and USA. 1 pound is approximately 454 grams.
• Ounces (oz): There are 16 ounces in a pound.

Key Rules for Converting Weight

1. Kilograms to Grams: Multiply by 1,000.
   • Example: 2 kg = 2 × 1,000 = 2,000 g
2. Grams to Kilograms: Divide by 1,000.
   • Example: 5,000 g = 5,000 ÷ 1,000 = 5 kg
3. Pounds to Grams: Multiply by 454.
   • Example: 2 lbs = 2 × 454 = 908 g
4. Grams to Pounds: Divide by 454.
   • Example: 908 g = 908 ÷ 454 ≈ 2 lbs
5. Ounces to Pounds: Divide by 16.
   • Example: 32 oz = 32 ÷ 16 = 2 lbs
6. Pounds to Ounces: Multiply by 16.
   • Example: 3 lbs = 3 × 16 = 48 oz

Tips and Tricks

• Memorise key conversions: Knowing that 1 kg = 1,000 g can help you convert quickly.
• Use a calculator: If you have one handy, it can make dividing and multiplying easier.
• Practice: The more you practise, the better you will get at converting weights!

Questions

Now, let’s test your knowledge with some questions!

Easy Level Questions

1. Convert 1 kg to grams.
2. Convert 500 g to kilograms.
3. How many grams are in 3 kg?
4. Convert 2 lbs to grams.
5. Convert 1 lb to ounces.
6. How many ounces are in 1 lb?
7. Convert 800 g to kg.
8. How many grams are there in 10 kg?
9. Convert 4 lbs to ounces.
10. Convert 1,500 g to kg.
11. How many kg are in 2,000 g?
12. Convert 3 kg to grams.
13. How many ounces are in 3 lbs?
14. Convert 2.5 kg to grams.
15. Convert 16 oz to lbs.
16. How many grams are in 5 lbs?
17. Convert 250 g to kg.
18. How many grams are in 7 kg?
19. Convert 32 oz to lbs.
20. How many pounds are in 1,000 g?

Medium Level Questions

1. Convert 4 kg to grams.
2. If a bag weighs 2.5 kg, how many grams is that?
3. Convert 2.2 lbs to grams.
4. How many ounces are in 2.5 lbs?
5. Convert 3,600 g to kg.
6. How many grams are in 5 lbs?
7. Convert 1.2 kg to grams.
8. If a child weighs 35 kg, how many grams is that?
9. Convert 10 lbs to ounces.
10. How many kg are in 4,500 g?
11. Convert 200 g to lbs.
12. How many ounces are in 5 kg?
13. Convert 7 lbs to grams.
14. What is 1.5 kg in grams?
15. If a package weighs 4 lbs, how many ounces is that?
16. Convert 3,200 g to kg.
17. How many grams are in 12 lbs?
18. Convert 24 oz to lbs.
19. How many kg are in 3,000 g?
20. Convert 5 kg to lbs.

Hard Level Questions

1. Convert 7.5 kg to grams.
2. If you have 2.5 lbs of flour, how many grams do you have?
3. Convert 1.8 kg to lbs.
4. How many ounces are in 4 kg?
5. Convert 4,200 g to lbs.
6. If a fish weighs 3 kg, how many lbs is that?
7. Convert 15 lbs to ounces.
8. How many grams are in 2.5 kg?
9. Convert 9 kg to lbs.
10. If a pack weighs 1,250 g, how many lbs is that?
11. Convert 36 oz to kg.
12. How many grams are in 2 lbs?
13. Convert 2.2 kg to oz.
14. How many ounces are in 10 kg?
15. Convert 5 lbs to kg.
16. If a cake weighs 1.5 kg, how many grams is that?
17. Convert 8 kg to pounds.
18. How many grams are in 0.5 lbs?
19. Convert 20 lbs to ounces.
20. If a dog weighs 30 kg, how many lbs is that?

Answers

Easy Level Answers

1. 1,000 g
2. 0.5 kg
3. 3,000 g
4. 908 g
5. 16 oz
6. 16 oz
7. 0.8 kg
8. 10,000 g
9. 32 oz
10. 1.5 kg
11. 2 kg
12. 3,000 g
13. 48 oz
14. 2,500 g
15. 1 lb
16. 2,268 g
17. 0.25 kg
18. 7,000 g
19. 2 lbs
20. 1 lb

Medium Level Answers

1. 4,000 g
2. 2,500 g
3. 998 g (approx.)
4. 40 oz
5. 3.6 kg
6. 2,268 g
7. 1,200 g
8. 35,000 g
9. 160 oz
10. 4.5 kg
11. 0.44 lbs (approx.)
12. 176.37 oz (approx.)
13. 3,175 g
14. 1,500 g
15. 64 oz
16. 3.2 kg
17. 5,443 g
18. 1.5 lbs (approx.)
19. 1.36 kg (approx.)
20. 11 lbs (approx.)

Hard Level Answers

1. 7,500 g
2. 1,134 g (approx.)
3. 3.97 lbs (approx.)
4. 141.09 oz (approx.)
5. 9.07 lbs (approx.)
6. 6.61 lbs (approx.)
7. 240 oz
8. 2,500 g
9. 19.84 lbs (approx.)
10. 2.76 lbs (approx.)
11. 1.02 kg (approx.)
12. 907 g (approx.)
13. 77.16 oz (approx.)
14. 352.74 oz (approx.)
15. 2.27 kg (approx.)
16. 1,500 g
17. 17.64 lbs (approx.)
18. 226.8 g (approx.)
19. 320 oz
20. 66.14 lbs (approx.)

Happy learning, Year 5! Keep practising your conversions, and soon, you’ll be a pro at converting units of weight!