Use this Guided Notes document, in either Google Sheets online form or printable PDF, to help teach your students their first lesson in percents. Percents are common in the real world outside of math class, but may be hard for students to understand. However, they are best understood as a ratio shown as a number over 100, for example 27/100; or 27 percent. Converting a ratio to a percent is actually very easy. One way is to create a proportion with the original ratio on one side, and the per