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The question asks for the percentage increase in temperature from 32 degrees Celsius (yesterday) to 40 degrees Celsius (today).

To calculate the percentage increase, we use the formula:

\[
\text{Percentage Increase} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100
\]

Here:
- The old value is 32°C,
- The new value is 40°C.

Substituting the values:

\[
\text{Percentage Increase} = \left( \frac{40 - 32}{32} \right) \times 100 = \left( \frac{8}{32} \right) \times 100 = 0.25 \times 100 = 25\%
\]

So, the temperature increased by **25%**.

Would you like more details on the calculation? Here are some related questions to explore:

1. How do we calculate the percentage decrease in a value?
2. What happens to the percentage increase if the temperature difference were larger?
3. Can you apply percentage increase to other fields, such as finance or population growth?
4. How is percentage increase different from absolute increase?
5. If the temperatures were given in Fahrenheit, how would the calculation change?

**Tip**: When calculating percentage changes, always subtract the original value from the new value and then divide by the original to find the change relative to the starting point.

Yesterday at noon the temperature was 32 degrees Celsius. Today at noon it was 40 degrees. By what percentage did the temperature increase?

Learn how to calculate the percentage increase in temperature from 32 degrees Celsius to 40 degrees Celsius. This example uses the basic percentage increase formula, suitable for students in Grades 6-8. Explore step-by-step calculations and related mathematical concepts.

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