https://file.aiquickdraw.com/mathbot/file/172672975746997zg1hzl.jpg

Let's go through the different tasks in the image:

### Oppgave 1 (Conversions):
- 400 m = **0.4 km** (Correct)
- 32 mm = **3.2 cm** (Correct)
- 68 cm = **6.8 dm** (Correct)
- 250 cm = **0.0025 km** (Minor correction: not 0.0015 but 0.0025)

### Oppgave 2 (Distance, Circumference, and Speed):
a) Distance from Rome to Oslo is 2500 km. How many mil (Swedish/Norwegian "mil") is that?
   \[
   \text{1 mil} = 10 \text{ km} \quad \Rightarrow \quad 2500 \text{ km} = 250 \text{ mil}
   \]

b) The Earth's circumference at the equator is approximately 40,000 km. How many mil is that?
   \[
   40,000 \text{ km} = 4,000 \text{ mil}
   \]
   (Your note shows the correct number).

c) A plane is flying at 850 km/h. How many mil does it cover in half an hour?
   \[
   850 \text{ km/h} \times 0.5 \text{ hours} = 425 \text{ km} \quad \Rightarrow \quad 425 \text{ km} = 42.5 \text{ mil}
   \]

### Oppgave 3 (Mass Unit Conversions):
- 0.6 kg = **600 g** (Correct)
- 300 g = **0.3 kg** (Correct)
- 0.4 g = **400 mg** (Correction: 400 mg, not 4000 mg)
- 750 mg = **0.75 g** (Correct)
- 2.13 hg = **213 g**
- 80 g = **0.8 hg**
- 7 hg = **0.7 kg**
- 0.54 kg = **5.4 hg**

### Oppgave 4 (Miscellaneous Questions):
a) A large crane can lift 220 tons. How many kilograms is this?
   \[
   220 \text{ tons} = 220,000 \text{ kg} \quad (\text{Correction to your note: should be 220,000 not 2,2000})
   \]

b) 1 inch = 2.54 cm. How many millimeters is 3.5 inches?
   \[
   3.5 \text{ inches} = 3.5 \times 2.54 = 8.89 \text{ cm} = 88.9 \text{ mm}
   \]

c) A drain pipe has a diameter of 110 mm. What is the circumference in cm?
   \[
   \text{Circumference} = 3.14 \times 110 \text{ mm} = 345.4 \text{ mm} = 34.54 \text{ cm}
   \]

Would you like to dive deeper into any of these problems or need further clarifications?

Here are 5 related questions:
1. What is the formula for converting km to miles?
2. How do you calculate speed in m/s if the speed is given in km/h?
3. What is the difference between milliliters and milligrams in mass and volume conversion?
4. How do you convert metric tons to pounds?
5. How can you calculate the area of a circle given its radius?

**Tip:** Remember to always double-check unit conversions, especially when dealing with mass, length, or speed units.

Conversion problems and unit calculations from Oppgave 1 to Oppgave 4, including tasks involving distance, circumference, speed, mass unit conversions, and circumference of a circle.

Solve unit conversions for distance, mass, and speed, including tasks on the circumference of a circle and mass conversion between kilograms, grams, and tons. Suitable for Grades 5-7.

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