Year 5 Maths: Useful Facts About Conversion

Hello Year 5! Today, we are going to learn about conversions in maths. This means changing one unit of measurement into another. For example, converting inches to centimetres, or litres to millilitres. Let’s break this down step by step!

What is Conversion?

Conversion is when we change a measurement from one unit to another. For example:

• Length: Converting from metres to centimetres.
• Weight: Converting from kilograms to grams.
• Volume: Converting from litres to millilitres.

Key Rules for Conversion

1. Know Your Units: It’s important to know the units you are working with. Here are some common ones:
   • Length:
     • 1 metre (m) = 100 centimetres (cm)
     • 1 kilometre (km) = 1000 metres (m)
   • Weight:
     • 1 kilogram (kg) = 1000 grams (g)
   • Volume:
     • 1 litre (l) = 1000 millilitres (ml)
2. Multiply or Divide: To convert, you either multiply or divide depending on the direction of the conversion.
   • If you are converting to a smaller unit, you multiply.
   • If you are converting to a larger unit, you divide.

Examples

• Length: Convert 5 metres to centimetres.
  • Since 1 metre = 100 centimetres, we multiply:
  $$5 \text{ m} \times 100 = 500 \text{ cm}$$
• Weight: Convert 3 kilograms to grams.
  • Since 1 kilogram = 1000 grams, we multiply:
  $$3 \text{ kg} \times 1000 = 3000 \text{ g}$$
• Volume: Convert 2 litres to millilitres.
  • Since 1 litre = 1000 millilitres, we multiply:
  $$2 \text{ l} \times 1000 = 2000 \text{ ml}$$

Tips and Tricks

• Use Conversion Charts: Keep a conversion chart handy to help you remember the values!
• Practice Makes Perfect: The more you practice, the easier it gets.
• Visualise: Draw a picture or use blocks to understand how much bigger or smaller one unit is compared to another.

Questions

Easy Level Questions

1. How many centimetres are in 2 metres?
2. Convert 1 kilogram to grams.
3. How many millilitres are in 1 litre?
4. Convert 5 km to metres.
5. If you have 500 grams, how many kilograms do you have?
6. Convert 3 litres to millilitres.
7. How many metres are in 10 cm?
8. Convert 2500 grams to kilograms.
9. How many millilitres are in 2 litres?
10. Convert 4 metres to centimetres.
11. If 1 kg = 1000 g, what is 0.5 kg in grams?
12. How many cm are in 3 m?
13. Convert 1.5 litres to millilitres.
14. How many grams are in 2.5 kg?
15. Convert 300 cm to metres.
16. How many litres are in 5000 ml?
17. Convert 6 kg to grams.
18. How many m are in 50 cm?
19. If you have 150 ml, how many litres do you have?
20. Convert 2.2 kg to grams.

Medium Level Questions

1. Convert 15 metres to centimetres.
2. How many grams are in 3.2 kg?
3. Convert 4.5 litres to millilitres.
4. If 1 km = 1000 m, how many m are in 3.5 km?
5. Convert 750 grams to kilograms.
6. How many cm are in 2.2 m?
7. Convert 0.75 litres to millilitres.
8. How many grams are in 0.8 kg?
9. Convert 1200 ml to litres.
10. If you have 2500 g, how many kg do you have?
11. Convert 8.5 m to cm.
12. How many litres are in 3000 ml?
13. Convert 1.2 kg to grams.
14. How many cm are in 0.9 m?
15. Convert 5.5 litres to ml.
16. How many grams are in 4.8 kg?
17. Convert 200 cm to m.
18. If you have 1000 ml, how many litres do you have?
19. Convert 3.3 kg to grams.
20. How many m are in 250 cm?

Hard Level Questions

1. If 1 kg = 1000 g, convert 7.25 kg to g.
2. Convert 9.8 m to cm.
3. How many grams are in 5.5 kg?
4. Convert 2.3 litres to millilitres and show your working.
5. If 1 km = 1000 m, convert 0.025 km to m.
6. Convert 1500 ml to litres.
7. If 1 m = 100 cm, convert 4.75 m to cm.
8. How many grams are in 3.75 kg?
9. Convert 0.02 km to m.
10. If you have 2500 ml, how many litres do you have?
11. Convert 12.5 kg to grams.
12. How many cm are in 1.5 m?
13. Convert 250 ml to litres.
14. If you have 5.4 kg, how many grams do you have?
15. Convert 3.6 litres to ml.
16. How many grams are in 0.35 kg?
17. Convert 30 cm to m.
18. If you have 800 ml, how many litres do you have?
19. Convert 2.85 kg to grams.
20. How many m are in 150 cm?

Answers

Easy Level Answers

1. 200 cm
2. 1000 g
3. 1000 ml
4. 5000 m
5. 0.5 kg
6. 3000 ml
7. 0.1 m
8. 2.5 kg
9. 2000 ml
10. 400 cm
11. 500 g
12. 300 cm
13. 1500 ml
14. 2500 g
15. 3 m
16. 5 l
17. 6000 g
18. 1.5 m
19. 0.15 l
20. 2200 g

Medium Level Answers

1. 1500 cm
2. 3200 g
3. 4500 ml
4. 3500 m
5. 0.75 kg
6. 220 cm
7. 750 ml
8. 800 g
9. 1.2 l
10. 2.5 kg
11. 850 cm
12. 3 l
13. 1200 g
14. 90 cm
15. 5500 ml
16. 4800 g
17. 2 m
18. 1 l
19. 3300 g
20. 2.5 m

Hard Level Answers

1. 7250 g
2. 980 cm
3. 5500 g
4. 2300 ml
5. 25 m
6. 1.5 l
7. 475 cm
8. 3750 g
9. 20 m
10. 2.5 l
11. 12500 g
12. 150 cm
13. 0.25 l
14. 5400 g
15. 3600 ml
16. 350 g
17. 0.3 m
18. 0.8 l
19. 2850 g
20. 1.5 m

That’s it for today’s lesson on conversion! Remember, practice makes perfect! Keep revising these conversions, and soon you will be an expert!