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Warm-up

45 120. 4. 14 16. 9 72. 24 64. 1. 3. 2. Warm-up. Write each fraction in simplest form. 7 8. 3 8. 1 8. 3 8. Write the following numbers in standard notation: 3.5832 x 10 9 8.284 x 10 -3 Compare the number of boys to girls in this class. 3583200000 0.008284.

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Warm-up

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  1. 45 120 4. 14 16 9 72 24 64 1. 3. 2. Warm-up Write each fraction in simplest form. 7 8 3 8 1 8 3 8 • Write the following numbers in standard notation: • 3.5832 x 109 • 8.284 x 10-3 • Compare the number of boys to girls in this class. 3583200000 0.008284 8. A magazine has page numbers from 1 to 80. What fraction of those page numbers include the digit 5? 17 80

  2. Learn to estimate ratios and rates frompictures and data.

  3. The number of boys = • The number of girls = • If we compare boys to girls we get ___ boys to _____ girls.

  4. What do we call a comparison between two or more quantities? We just found the RATIO of boys to girls. RATIO Is the ratio of girls to boys the same ? No, when writing a ratio, ORDER matters.

  5. It’s Friday night and your friends are having a party…… The ratio of guys to girls is 12 to 2. Would you want to attend the party?

  6. How many basketballs to footballs are there? • For every 4 basketballs there are 6 footballs. • The ratio is 4 to 6.

  7. What are some other ways we can write the ratio of basketball to footballs? • 4 to 6 • 4 : 6 • 4 6 Every ratio can be written in 3 ways: First quantity to Second quantity First quantity : Second quantity First quantity divided by the second quantity (as a fraction). Careful!! Order matters!!!! 4 to 6 Is NOT the same as 6 to 4

  8. Write the ratio of sandwiches to coke bottles 3 different ways. Since a fraction can be simplified, We can simplify the ratio 6/8 to 3/4. The ratio of sandwiches to coke bottles can also be expressed as 3 : 4 or 3 to 4. In other words, ratios can be simplified to form equivalent ratios.

  9. Write all the ratios that can be made using the figure. Did you get six? Blue area to Gold area: 3 to 5 Gold area to Blue area: 5 to 3 Blue area to Total area: 3 to 8 Total area to Blue area: 8 to 3 Gold area to Total area: 5 to 8 Total area to Gold area: 8 to 5

  10. Write all the ratios that can be made using the figure. Did you get six? Purple area to Gray area: 5 to 3 Gray area to Purple area: 3 to 5 Gray area to Total area: 3 to 8 Total area to Gray area: 8 to 3 Purple area to Total area: 5 to 8 Total area to Purple area: 8 to 5

  11. Yesterday the fax machine at Putnam Middle School handled 28 incoming faxes and 49 outgoing faxes. Estimate each ratio. Incoming faxes to outgoing faxes. b. Total faxes to incoming faxes. 28 estimates to 30 49 estimates to 50 30/50 or 3/5 80/30 or 8/3

  12. Yesterday the fax machine at Putnam Middle School handled 39 incoming faxes and 27 outgoing faxes. Estimate each ratio. Incoming faxes to outgoing faxes. b. Total faxes to incoming faxes. 39 estimates to 40 27 estimates to 30 40/30 or 4/3 70/40 or 7/4

  13. Homework: Practice 5.1 all Work on Explain It! Remember: Daily Quiz Tomorrow

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