Converting units of volume: practice problems for converting liters to milliliters and milliliters to liters.

Let's solve the problem step by step.

We are converting between liters (l) and milliliters (ml).
The key conversion factor is:

> 1 liter (l) = 1000 milliliters (ml)

This means:
- To convert liters to milliliters, multiply by 1000.
- To convert milliliters to liters, divide by 1000.

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Part 1: Convert liters to milliliters

| Problem | Solution |
|--------|----------|
| 7 l = ? ml | $ 7 \times 1000 = 7000 $ ml |
| 9 l = ? ml | $ 9 \times 1000 = 9000 $ ml |
| 5 l = ? ml | $ 5 \times 1000 = 5000 $ ml |
| 13 l = ? ml | $ 13 \times 1000 = 13,000 $ ml |

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Part 2: Convert milliliters to liters

| Problem | Solution |
|--------|----------|
| 2000 ml = ? l | $ 2000 \div 1000 = 2 $ l |
| 3000 ml = ? l | $ 3000 \div 1000 = 3 $ l |
| 8000 ml = ? l | $ 8000 \div 1000 = 8 $ l |
| 19000 ml = ? l | $ 19000 \div 1000 = 19 $ l |

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Part 3: Convert milliliters to liters (larger values)

| Problem | Solution |
|--------|----------|
| 6,500 ml = ? l | $ 6500 \div 1000 = 6.5 $ l |
| 8,400 ml = ? l | $ 8400 \div 1000 = 8.4 $ l |
| 2,900 ml = ? l | $ 2900 \div 1000 = 2.9 $ l |
| 10,700 ml = ? l | $ 10700 \div 1000 = 10.7 $ l |

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Part 4: Convert liters to milliliters (decimal values)

| Problem | Solution |
|--------|----------|
| 5.3 l = ? ml | $ 5.3 \times 1000 = 5300 $ ml |
| 2.7 l = ? ml | $ 2.7 \times 1000 = 2700 $ ml |
| 3.9 l = ? ml | $ 3.9 \times 1000 = 3900 $ ml |
| 12.3 l = ? ml | $ 12.3 \times 1000 = 12,300 $ ml |

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Part 5: Convert small liters to milliliters

| Problem | Solution |
|--------|----------|
| 0.5 l = ? ml | $ 0.5 \times 1000 = 500 $ ml |
| 0.9 l = ? ml | $ 0.9 \times 1000 = 900 $ ml |
| 0.25 l = ? ml | $ 0.25 \times 1000 = 250 $ ml |
| 0.42 l = ? ml | $ 0.42 \times 1000 = 420 $ ml |

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Part 6: Convert milliliters to liters (small values)

| Problem | Solution |
|--------|----------|
| 500 ml = ? l | $ 500 \div 1000 = 0.5 $ l |
| 400 ml = ? l | $ 400 \div 1000 = 0.4 $ l |
| 900 ml = ? l | $ 900 \div 1000 = 0.9 $ l |
| 700 ml = ? l | $ 700 \div 1000 = 0.7 $ l |

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✔ Final Answer Summary:

Liters to Milliliters:
- 7 l = 7000 ml
- 9 l = 9000 ml
- 5 l = 5000 ml
- 13 l = 13,000 ml
- 5.3 l = 5300 ml
- 2.7 l = 2700 ml
- 3.9 l = 3900 ml
- 12.3 l = 12,300 ml
- 0.5 l = 500 ml
- 0.9 l = 900 ml
- 0.25 l = 250 ml
- 0.42 l = 420 ml

Milliliters to Liters:
- 2000 ml = 2 l
- 3000 ml = 3 l
- 8000 ml = 8 l
- 19000 ml = 19 l
- 6,500 ml = 6.5 l
- 8,400 ml = 8.4 l
- 2,900 ml = 2.9 l
- 10,700 ml = 10.7 l
- 500 ml = 0.5 l
- 400 ml = 0.4 l
- 900 ml = 0.9 l
- 700 ml = 0.7 l

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✔ Remember:
Always use the rule:
- Multiply by 1000 when going from l → ml
- Divide by 1000 when going from ml → l

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