90% of 90 can be calculated by multiplying 90 by 0.90 (which is the decimal equivalent of 90%).

\[
90 \times 0.90 = 81
\]

So, 90% of 90 is **81**.

Would you like more details or have any further questions?

Here are 5 related questions to expand your understanding:
1. What is 75% of 90?
2. How would you calculate 90% of a different number, say 120?
3. How can you express 90% as a fraction and use that to find 90% of 90?
4. What is the result of finding 90% of 180?
5. How do percentage calculations relate to proportionality?

**Tip:** To quickly calculate percentages, remember that multiplying by a percentage means converting the percentage to a decimal first.

Learn how to calculate 90% of 90 with a simple, step-by-step method. This problem introduces key percentage concepts and basic arithmetic formulas. Perfect for students in Grades 5-7 looking to master percentage calculations.

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