12, because 15 percent means 15 of every 100. Percent problems can be checked by finding 10% first; 10% of 80 is 8, so 15% is 8 + 4.

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What is 15% of 80?

12, because 15 percent means 15 of every 100.

Why: Convert 15% to 0.15. Multiply 0.15 by 80. 0.15 x 80 = 12.

Huh, didn't know that: Percent problems can be checked by finding 10% first; 10% of 80 is 8, so 15% is 8 + 4.

The dad joke

What do you call a number that just cannot stay in place? A roamin' numeral.

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References

Answer: 12. Convert 15% to 0.15. Multiply 0.15 by 80. 0.15 x 80 = 12.

OpenStax Prealgebra 2e, 6.1 Understand Percent openstax.org/books/prealgebra-2e/pages/6-1-understand-percent
A percent is a ratio whose denominator is 100.
Checked 2026-10-12.

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