Introduction to Changing the Unit

Hello everyone! Today, we’re going to learn about changing the unit. This means switching from one measurement to another. It’s like changing your clothes for different weather!

For example, if we know how many centimetres something is, we might want to know how many metres that is.

Why Do We Change Units?

We change units to make it easier to understand or to compare different measurements. Sometimes, different situations require different units. For example:

  • Length: We can measure in millimetres (mm), centimetres (cm), metres (m), or kilometres (km).
  • Weight: We use grams (g) and kilograms (kg).
  • Capacity: We measure in millilitres (ml) and litres (l).

Key Rules for Changing Units

1. Know the Relationships

It’s important to know how units relate to each other. Here are some common relationships:

  • Length:
    • 10 mm = 1 cm
    • 100 cm = 1 m
    • 1,000 m = 1 km
  • Weight:
    • 1,000 g = 1 kg
  • Capacity:
    • 1,000 ml = 1 l

2. Multiply or Divide

  • To change to a larger unit, you divide.
  • To change to a smaller unit, you multiply.

3. Practice Makes Perfect

The more you practice, the easier it will become!

Examples

Example 1: Changing Centimetres to Metres

If you have 250 cm and want to change it to metres, you divide by 100:

$$

250 \text{ cm} \div 100 = 2.5 \text{ m}

$$

Example 2: Changing Kilograms to Grams

If you have 3 kg and want to change it to grams, you multiply by 1,000:

$$

3 \text{ kg} \times 1,000 = 3,000 \text{ g}

$$

Tips and Tricks

  • Use a Conversion Table: Keep a small table handy for quick reference.
  • Draw a Diagram: Sometimes, drawing can help you visualise the units better.
  • Practice with Real-life Examples: Measure things around you and convert the units!

Questions

Easy Level Questions

  1. How many centimetres are in 1 metre?
  2. Convert 150 cm to metres.
  3. How many millilitres are in 1 litre?
  4. Convert 2 kg to grams.
  5. How many grams are in 500 g?
  6. Convert 1.5 m to centimetres.
  7. How many millimetres are in 1 cm?
  8. Convert 3 m to centimetres.
  9. How many litres are in 2,000 ml?
  10. Convert 600 g to kg.
  11. How many metres are in 300 cm?
  12. Convert 4 litres to millilitres.
  13. How many grams are in 2 kg?
  14. Convert 500 mm to cm.
  15. How many centimetres are in 2 metres?
  16. Convert 250 ml to litres.
  17. How many millilitres are in 1.5 litres?
  18. Convert 800 g to kg.
  19. How many kilograms are in 2,500 g?
  20. Convert 5 m to mm.

Medium Level Questions

  1. Convert 1.2 m to cm.
  2. How many grams are in 3.5 kg?
  3. Convert 1,500 ml to litres.
  4. How many centimetres are in 4.5 m?
  5. Convert 750 g to kg.
  6. How many litres are in 3,000 ml?
  7. Convert 2.2 m to cm.
  8. How many grams are in 2.8 kg?
  9. Convert 1.75 l to ml.
  10. How many mm are in 6.3 cm?
  11. Convert 5,000 g to kg.
  12. How many cm are in 1.8 m?
  13. Convert 0.5 l to ml.
  14. How many mm are in 3 m?
  15. Convert 2.5 kg to g.
  16. How many kg are in 3,200 g?
  17. Convert 4.2 m to cm.
  18. How many grams are in 0.8 kg?
  19. Convert 1.5 m to mm.
  20. How many litres are in 750 ml?

Hard Level Questions

  1. Convert 12.5 l to ml.
  2. How many grams are in 0.65 kg?
  3. Convert 7.8 m to cm.
  4. How many mm are in 0.9 m?
  5. Convert 1,250 g to kg.
  6. How many cm are in 5.5 m?
  7. Convert 3.6 kg to grams.
  8. How many litres are in 4,500 ml?
  9. Convert 2.2 m to mm.
  10. How many g are in 1.1 kg?
  11. Convert 9.4 l to ml.
  12. How many kg are in 5,500 g?
  13. Convert 0.75 m to cm.
  14. How many mm are in 12 cm?
  15. Convert 6.1 kg to grams.
  16. How many litres are in 2,250 ml?
  17. Convert 15.3 m to cm.
  18. How many grams are in 5.5 kg?
  19. Convert 3,600 ml to litres.
  20. How many cm are in 8.2 m?

Answers

Easy Level Answers

  1. 100 cm
  2. 1.5 m
  3. 1,000 ml
  4. 2,000 g
  5. 500 g
  6. 150 cm
  7. 10 mm
  8. 300 cm
  9. 2 l
  10. 0.6 kg
  11. 3 m
  12. 4,000 ml
  13. 2,000 g
  14. 50 cm
  15. 200 cm
  16. 0.25 l
  17. 1,500 ml
  18. 0.8 kg
  19. 2.5 kg
  20. 5,000 mm

Medium Level Answers

  1. 120 cm
  2. 3,500 g
  3. 1.5 l
  4. 450 cm
  5. 0.75 kg
  6. 3 l
  7. 220 cm
  8. 2,800 g
  9. 1,750 ml
  10. 63 mm
  11. 5 kg
  12. 180 cm
  13. 500 ml
  14. 3,000 mm
  15. 2,500 g
  16. 4.2 kg
  17. 420 cm
  18. 800 g
  19. 1,500 mm
  20. 0.75 l

Hard Level Answers

  1. 12,500 ml
  2. 650 g
  3. 780 cm
  4. 90 mm
  5. 1.25 kg
  6. 550 cm
  7. 3,600 g
  8. 4.5 l
  9. 2,200 mm
  10. 1,100 g
  11. 9,400 ml
  12. 5.5 kg
  13. 75 cm
  14. 120 mm
  15. 6,100 g
  16. 2.25 l
  17. 1,530 cm
  18. 5,500 g
  19. 3.6 l
  20. 82 cm

Remember, practice is key! Keep working on these questions, and soon changing the unit will become second nature to you! Happy learning!