Standard practice
A percent selects a part of a whole.
Noor looks at 80 stickers at the school store. The task is to find 25% of that whole.
A percent is a ratio to 100. Finding a percent of a number scales that ratio to a new whole. Subtracting the percent from the whole treats a rate as if it were already an amount.
Problem 1 of 9. Activate, study a model, try guided items, work independently, apply, and reflect.