To calculate the percentage increase from 10 to 15, use the formula:

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

Substitute the values:

\[
\text{Percentage Increase} = \left( \frac{15 - 10}{10} \right) \times 100 = \left( \frac{5}{10} \right) \times 100 = 0.5 \times 100 = 50\%
\]

So, the percentage increase from 10 to 15 is **50%**.

Would you like more details or have any questions?

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1. How do you calculate percentage decrease?
2. What is the formula for finding percentage change in general?
3. How can we apply percentage change in real-life scenarios?
4. How do you find the original value if the final value and percentage increase are given?
5. What is the difference between percentage increase and growth rate?

**Tip:** Remember that to calculate percentage change, always subtract the old value from the new value and then divide by the old value.

Discover how to calculate the percentage increase from 10 to 15 using the percentage change formula. This straightforward example provides a step-by-step solution for understanding percentage increase, suitable for students in Grades 6-8.

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