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To solve the problem:

We are given that 19 of the 40 trees in a park are elm trees, and we need to find the percentage of trees that are **not** elm trees.

### Step-by-Step Solution:

1. **Number of trees that are not elm trees**:
   - Total trees: 40
   - Elm trees: 19
   - Trees that are not elm trees = Total trees - Elm trees = 40 - 19 = 21 trees.

2. **Percentage of trees that are not elm trees**:
   The formula for percentage is:
   \[
   \text{Percentage} = \left(\frac{\text{Number of non-elm trees}}{\text{Total number of trees}}\right) \times 100
   \]
   Substituting the numbers:
   \[
   \text{Percentage} = \left(\frac{21}{40}\right) \times 100 = 52.5\%
   \]

### Final Answer:
The percentage of trees that are **not** elm trees is **52.5%**.

Would you like more details or have any other questions? Here are five related questions to explore:

1. How would you calculate the percentage of elm trees in the park?
2. If the number of elm trees increased to 25, how would the percentage of non-elm trees change?
3. How do you calculate percentages when dealing with different totals?
4. Can you express the fraction of non-elm trees as a simplified fraction?
5. How would you calculate the number of non-elm trees if you only knew the percentage?

**Tip:** To find percentages quickly, always remember the formula: \(\text{Percentage} = \left(\frac{\text{part}}{\text{whole}}\right) \times 100\).

19 of the 40 trees in a park are elm trees. What percentage of the trees in the park are not elm trees? Give your answer to 1 d.p.

Learn how to calculate the percentage of trees in a park that are not elm trees. Out of 40 trees, 19 are elm trees. This problem involves percentage calculation, subtraction, and gives the answer to 1 decimal place. Suitable for students in Grades 6-8.

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