**Q: **Is percentage a number or ratio expressed as a fraction of 100? ¶

**A: **Yes.

**Q: **Are percentages to be written? ¶

**A: **Yes.

**Q: **Is percentage relative to? ¶

**A: **Yes.

**Q: **Are percentages used as ratios to express how large or small one quantity is relative to another quantity? ¶

**A: **Yes.

**Q: **Is percentage also used to express composition of a mixture by mass percent and mole percent? ¶

**A: **Yes.