Adding Litres and Millilitres Worksheet | Twinkl Resources - Free Printable

Let's solve the Addition of Millilitres and Litres problems step by step. The key concept is:

> 1 litre (L) = 1000 millilitres (mL)

We will convert all values to the same unit (either mL or L), perform the addition, and then express the final answer in both millilitres and litres as required.

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🔹 Left Page Problems:

#### 1. $ \frac{1}{2}L + 2670mL + 3.2L $

- Convert everything to mL:
- $ \frac{1}{2}L = 500mL $
- $ 3.2L = 3200mL $
- Now add:
$ 500 + 2670 + 3200 = 6370mL $
- Convert back to litres:
$ 6370mL = 6.37L $

✔ Answer:
- 6370 mL
- 6.37 L

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#### 2. $ 3910mL + 3.4L + 710mL $

- Convert 3.4L → 3400mL
- Add:
$ 3910 + 3400 + 710 = 8020mL $
- $ 8020mL = 8.02L $

✔ Answer:
- 8020 mL
- 8.02 L

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#### 3. $ 2.25L + 1930mL + 2\frac{1}{4}L $

- Convert mixed numbers:
- $ 2\frac{1}{4}L = 2.25L $
- So total in L:
$ 2.25 + 2.25 = 4.5L $
- Add 1930mL = 1.93L
- Total: $ 4.5 + 1.93 = 6.43L $
- In mL: $ 6.43 × 1000 = 6430mL $

✔ Answer:
- 6430 mL
- 6.43 L

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#### 4. $ 500mL + 7.9L + 9310mL $

- Convert 7.9L → 7900mL
- Add:
$ 500 + 7900 + 9310 = 17710mL $
- $ 17710mL = 17.71L $

✔ Answer:
- 17710 mL
- 17.71 L

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#### 5. $ 0.45L + 7640mL + 2.2L $

- Convert 0.45L → 450mL
- 2.2L → 2200mL
- Add:
$ 450 + 7640 + 2200 = 10290mL $
- $ 10290mL = 10.29L $

✔ Answer:
- 10290 mL
- 10.29 L

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#### 6. $ 5.5L + 10.5L + 3410mL $

- Convert 3410mL → 3.41L
- Add:
$ 5.5 + 10.5 + 3.41 = 19.41L $
- $ 19.41L = 19410mL $

✔ Answer:
- 19410 mL
- 19.41 L

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#### 7. $ 620mL + 8L + 0.18L $

- Convert 620mL → 0.62L
- Add:
$ 0.62 + 8 + 0.18 = 8.8L $
- $ 8.8L = 8800mL $

✔ Answer:
- 8800 mL
- 8.8 L

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🔹 Right Page Problems:

#### 8. $ \frac{1}{4}L + 2470mL + 3.2L $

- $ \frac{1}{4}L = 250mL $
- 3.2L = 3200mL
- Add:
$ 250 + 2470 + 3200 = 5920mL $
- $ 5920mL = 5.92L $

✔ Answer:
- 5920 mL
- 5.92 L

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#### 9. $ 3910mL + 3.4L + 710mL $

This is the same as problem 2, so:
- $ 3910 + 3400 + 710 = 8020mL = 8.02L $

✔ Answer:
- 8020 mL
- 8.02 L

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#### 10. $ 2.25L + 1930mL + 2\frac{1}{4}L $

Same as problem 3:
- $ 2.25 + 2.25 = 4.5L $, plus 1.93L → 6.43L = 6430mL

✔ Answer:
- 6430 mL
- 6.43 L

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#### 11. $ 500mL + 7.9L + 9310mL $

Same as problem 4:
- $ 500 + 7900 + 9310 = 17710mL = 17.71L $

✔ Answer:
- 17710 mL
- 17.71 L

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#### 12. $ 0.45L + 7640mL + 2.2L $

Same as problem 5:
- $ 450 + 7640 + 2200 = 10290mL = 10.29L $

✔ Answer:
- 10290 mL
- 10.29 L

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#### 13. $ 5.5L + 10.5L + 3410mL $

Same as problem 6:
- $ 5.5 + 10.5 + 3.41 = 19.41L = 19410mL $

✔ Answer:
- 19410 mL
- 19.41 L

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#### 14. $ 620mL + 8L + 0.18L $

Same as problem 7:
- $ 0.62 + 8 + 0.18 = 8.8L = 8800mL $

✔ Answer:
- 8800 mL
- 8.8 L

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#### 15. $ 9900mL + 0.02L + 1.7L $

- Convert:
- 9900mL = 9.9L
- 0.02L = 0.02L
- 1.7L = 1.7L
- Add:
$ 9.9 + 0.02 + 1.7 = 11.62L $
- $ 11.62L = 11620mL $

✔ Answer:
- 11620 mL
- 11.62 L

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#### 16. $ 3.4L + 890mL + 1.2L $

- Convert 890mL → 0.89L
- Add:
$ 3.4 + 0.89 + 1.2 = 5.49L $
- $ 5.49L = 5490mL $

✔ Answer:
- 5490 mL
- 5.49 L

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#### 17. $ 5.8L + 240mL + 1.5L $

- Convert 240mL → 0.24L
- Add:
$ 5.8 + 0.24 + 1.5 = 7.54L $
- $ 7.54L = 7540mL $

✔ Answer:
- 7540 mL
- 7.54 L

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#### 18. $ 1.3L + 7370mL + 4.1L $

- Convert 7370mL → 7.37L
- Add:
$ 1.3 + 7.37 + 4.1 = 12.77L $
- $ 12.77L = 12770mL $

✔ Answer:
- 12770 mL
- 12.77 L

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✔ Summary Table:

| Problem | Answer (mL) | Answer (L) |
|--------|-------------|------------|
| 1 | 6370 | 6.37 |
| 2 | 8020 | 8.02 |
| 3 | 6430 | 6.43 |
| 4 | 17710 | 17.71 |
| 5 | 10290 | 10.29 |
| 6 | 19410 | 19.41 |
| 7 | 8800 | 8.8 |
| 8 | 5920 | 5.92 |
| 9 | 8020 | 8.02 |
| 10 | 6430 | 6.43 |
| 11 | 17710 | 17.71 |
| 12 | 10290 | 10.29 |
| 13 | 19410 | 19.41 |
| 14 | 8800 | 8.8 |
| 15 | 11620 | 11.62 |
| 16 | 5490 | 5.49 |
| 17 | 7540 | 7.54 |
| 18 | 12770 | 12.77 |

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📌 Tips for Solving:

- Always convert to a common unit (preferably mL).
- Use the conversion: 1 L = 1000 mL
- After adding, convert result back into both units.
- Be careful with fractions and decimals.

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