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FACTOR LABEL / PROBLEM SOLVING Chapter 4

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Three step approach 1. Analyze a. What is known? b. What is unknown? c. Plan a solution strategy 2. Calculate 3. Evaluate a. Does my answer make sense?

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Conversion Factors You should know these conversion factors: 1 gram = 1000 mg (milligrams) 1 gram = 100 cg (centigrams) 1000 gram = 1 kg (kilogram)

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Dimensional Analysis (Factor Label) Problem solving method Example: How many miles is equal to 57.2 km? Conversion factors: ? miles = 57.2 km 0.621 mi = 1 km 57.2 km 1 km 0.621 mi = 35.5 mi ** Always start with the value equal to your unknown ** The next value should be your conversion factor ** The unit that you start with must be the unit on the bottom of the next conversion factor

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Multi-step Problem How many years old is a person who is 350,500,000 seconds old? 350,500,000 sec 60 sec 1 min = 11.11 years 60 min 1 hr 24 hr 1 day 365 days 1 yr

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1 Chapter 3 Problem Solving. 2 Word Problems n The laboratory does not give you numbers already plugged into a formula. n You have to decide how to get.

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