80% of 90 is calculated by multiplying 90 by 0.80:

\[
80\% \times 90 = 0.80 \times 90 = 72
\]

Thus, 80% of 90 is **72**.

Would you like a more detailed explanation or have any questions?

Here are some related questions:
1. What is 75% of 120?
2. How do you calculate 20% of 250?
3. If 90 is 80%, what is the full value?
4. What is the percentage increase from 72 to 90?
5. How would you calculate 80% of a different number, like 150?

**Tip**: Percentages can always be converted to decimals by dividing by 100.

Easily calculate 80% of 90 by multiplying 90 by 0.80. Learn how to convert percentages into decimals and perform quick calculations. In this example, 80% of 90 is 72, a useful skill for students in Grades 5-7.

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