To decrease 30 by 70%, follow these steps:

1. Find 70% of 30:
\[
70\% \times 30 = \frac{70}{100} \times 30 = 21
\]

2. Subtract 21 from 30:
\[
30 - 21 = 9
\]

So, decreasing 30 by 70% gives **9**.

Would you like more details on the process or have any questions?

Here are 5 related questions to consider:
1. What is 70% of 50?
2. How do you decrease 45 by 60%?
3. What happens if you decrease 100 by 25%?
4. How would you calculate a 15% increase on 30?
5. What is 30 decreased by 90%?

**Tip:** To decrease a number by a percentage, multiply the number by the percentage (as a decimal) and subtract the result from the original value.

Learn how to decrease 30 by 70 percent with a simple step-by-step explanation. This problem involves basic percentage and arithmetic calculations, making it suitable for students in Grades 4-6. Follow the method to find the solution: 30 - 21 = 9.

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