To decrease 1000 by 15%, you can calculate:

\[
1000 \times \left( 1 - \frac{15}{100} \right) = 1000 \times 0.85 = 850
\]

So, 1000 decreased by 15% is **850**.

Would you like further details on how percentages work or have any other questions?

Here are 5 related questions:
1. How do you calculate a 15% increase instead of a decrease?
2. What is 15% of 500?
3. If you decrease 850 by 15%, what do you get?
4. How do you calculate percentage change between two numbers?
5. Can you explain how to calculate discounts using percentages?

**Tip:** When decreasing a number by a percentage, multiply the number by \(1 - \text{percentage in decimal form}\).

Learn how to calculate a 15% decrease on 1000, resulting in 850. This guide walks through the simple steps of using percentages and multiplication, perfect for students in Grades 5-7.

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