1 / 5

Purpose: To solve problems using ratios.

7.1 Ratios. Purpose: To solve problems using ratios. Homework: p. 289 1-31 odd and p. 291 (problems) 1-9 all. Express the ratio pf 3 to 8 in 3 different ways. 3 ÷ 8 3 : 8 3 8. Write each ratio in simplest form. 45x:30x = 3/2 18ab² 14a²b = 9b 7a. Expressing Ratios.

chassidy-evans
Télécharger la présentation

Purpose: To solve problems using ratios.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 7.1 Ratios • Purpose: To solve problems using ratios. • Homework: p. 289 1-31 odd and p. 291 (problems) 1-9 all.

  2. Express the ratio pf 3 to 8 in 3 different ways. 3 ÷ 8 3 : 8 3 8 Write each ratio in simplest form. 45x:30x = 3/2 18ab² 14a²b = 9b 7a Expressing Ratios

  3. 5 days : 18 hours You need the same unit of measure for both. 1 day = 24 hours so 5 days = 120 hours. 120 hours 18 hours = 20:3 or 20/3 Write the ratio of the weight of a 20g marble to a 30kg bowling ball. Convert to the same unit. 1000kg = 1g. 20g = 20g 30kg 30,000g = 1:1500 Expressing Ratios (cont.)

  4. Solving Ratios • The ratio of boys to girls enrolled in chemistry is 5:4. If the total number of students taking chemistry is 981, how many boys and girls are enrolled in chemistry? • Let 5x = # of boys and 4x = # of girls. • Add 5x + 4x = 981 and Solve for x. • 9x = 981, x = 109 • You now need to plug 109 into the x’s so • 5(109) = 545 boys 4(109) = 436 girls

  5. Solving Ratios (cont.) • The heights of 3 brothers are in the ratio13:14:15. Their combined heights equal 210 in. Find the height of each brother. • Let the heights = 13x, 14x 15x. • Add 13x + 14x + 15x = 210. SOLVE. • 42x = 210. x = 210. PLUG IN. • 13(210), 14(210), 15(210) • The heights are 65 in., 70 in., and 75 in.

More Related