Student Edition - Mathematics in Context - Britannica

• Use a double number line.For a percent decrease, to find the length of a 20-cm photoreduced to 80%:0 cm 4 cm 16 cm 20 cm0% 20% 80% 100%• Use arrow language.For a percent increase, to find the total cost of an item with a19% sales tax included:Price⎯⎯ 1.19⎯⎯⎯→Total, tax includedBrenda and Kim are writing an article for the school newspaper. Theyneed to reduce a photo with dimensions 12 cm by 18 cm.1. a. What are the new dimensions of the picture if it is reducedto 50%?b. If the original picture is reduced to 75%?Afterward, the layout editor informs them that she allotted a blankspace of 5 cm by 10 cm for their photo.2. What reduction can Brenda and Kim use to fit their photo in theallotted blank space?Ron and Ben are designing a poster for the school band concert.They have a picture they want to make 5 times as long and wideas it is now.3. a. What enlargement would they have to make to have allmeasurements 5 times as big?Section D: More or Less 33