2-6 Ratios, Rates and Conversion

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Presentation transcript:

2-6 Ratios, Rates and Conversion

Definitions Ratios Rate Unit rate Compares two numbers by division Cm/lbs Unit rate Compares two numbers by division A ratio that compares quantities measured in different units Rate with a denominator of 1

Conversion factor Ratio of two equivalent measures in different units

Comparing Unit Rates You are shopping for t- shirts. Which store offers the best deal? Store A - $25 for 2 Store B - $45 for 4 Store C - $30 for 3 Divide $25 by 2 to get price per shirt Divide $45 by 4 to get price per shirt Divide $30 by 3 to get price per shirt http://www.pearsonsuccessnet.com/snpapp/iText/products/0-13-368848-8-01/media/National/NA_SDC_A1/A1G0206_01SOP.mp4

Trisha ran 10km in 2. 5 h. Jason ran 7. 5km in 2h. Olga ran 9 Trisha ran 10km in 2.5 h. Jason ran 7.5km in 2h. Olga ran 9.5 km in 2.25h. Who had the fastest average speed?

Converting Unit Rates How do you choose the conversion factor? Get common units Divide 330 hours→ min 330 x 1h/60min http://www.pearsonsucce ssnet.com/snpapp/iText/ products/0-13-368848-8- 01/media/National/NA_S DC_A1/A1G0206_02SO P.mp4 15kg → grams 15kg x 1000g/1kg 1250cm → m

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