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To estimate the cost of one phone case, follow these steps:

1. **Round the total cost**: The total cost is £240.30. Round this to the nearest whole number, which is £240.
2. **Round the number of phone cases**: Dylan bought 18 phone cases, which can be kept as 18 (as it's already a relatively simple number).
3. **Divide the rounded total cost by the number of phone cases**:  
   \[
   \frac{240}{18} = \frac{240 \div 6}{18 \div 6} = \frac{40}{3} \approx 13.33
   \]

So, the estimated cost of one phone case is approximately **£13.33**.

### Working
1. Rounded total cost: £240
2. Number of phone cases: 18
3. Cost per phone case: \(\frac{240}{18} \approx 13.33\)

Would you like further details or have any questions about this estimation?

### Related Questions:
1. How would the exact cost per phone case differ from this estimate?
2. Why is estimation useful in everyday calculations?
3. How can rounding affect the accuracy of an estimation?
4. What would the cost per phone case be if the total cost was £250 instead?
5. How would the estimation change if Dylan bought 20 phone cases for £240?

**Tip:** Estimating by rounding numbers to the nearest ten or hundred makes division simpler and quicker to perform mentally.

Dylan buys 18 identical phone cases for £240.30. Estimate the cost of one phone case.

Learn how to estimate the cost of one phone case when Dylan buys 18 identical cases for £240.30. This problem focuses on the concept of estimation, rounding, and basic division, suitable for students in Grades 5-7.

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