Find two factors that multiply to each of:

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Presentation transcript:

Find two factors that multiply to each of: 48 72 60 January 11, 2010 Math 102 OBJECTIVE: Students will be able to use estimation to justify the reasonableness of answers AIM: How do we estimate? STANDARDS: 7.N.19 PRIOR KNOWLEDGE: Round the following to the nearest underlined digit: 3.678 453,899 0.587 Find two factors that multiply to each of: 48 72 60

Mini Lesson: An estimate is a calculation that is reasonably close to an exact answer What are some of the ways we estimate in daily life? In math, we can use estimation to see if our answer makes sense: Example Darryl weighs 179.1 pounds. Alicia weighs 122.8 pounds. About how much more does Darryl weigh than Alicia?

Step 1 Round Darryl’s weight to the nearest whole pound Step 2 Round Alicia’s weight to the nearest whole pound Step 3 Subtract Alicia’s weight from Darryl’s rounded weight 179 pounds – 123 pounds = 56 pounds

Example Keisha has 51 brownies to divide among 13 friends. About how many brownies will each friend get? Strategy: Find compatible numbers – numbers that are easy to divide Step 1 Find compatible numbers that are close to 51 and 13 Try 48 and 12 Step 2 Divide the compatible numbers A reasonable estimate of the number of brownies each friend received is 4