Tuesday September 24th, 2013

Today in class:

Lucy gets a makeover

I went over the 5 step problem solving method in class and we worked through several examples. I told students that it is important to show their work and to follow the 5 steps every time they solve a problem, equation or formula in class. If they do not show their work, then the answer is incorrect. I also reminded them that measurements MUST HAVE a numerical value and a unit attached to it. Again if either is missing, the answer will be marked wrong.

The 5 step method is:

1. Identify the formula you will use or the conversion factor needed. Write it down on the paper. EXAMPLE: the conversion factor that allows you to go from kilometers to miles is: 1 mi/1.6km OR the reciprocal 1.6km/1mi

2. Identify your known and unknown values. Write them on the paper. EXAMPLE: Let's say you are in Paris and want to see the Eiffel Tower which is 15.6 km from your hotel. You want to know how many miles that is. Your known is 15.6 Km and your unknown is X miles.

3. Set up your equation or formula. Write it down on the paper. EXAMPLE: 15.6Km/1 x 1mi/1.6Km = ? Note I HAD to choose the conversion factor that has the unit I want to cancel out in the denominator so it cancels. This sets up the rest of the problem so Km cancels and so do the 1's leaving me with 15.6/ 1.6= ? miles. (remember you still have the uncancelled uit mi there to use)

4. Solve the equation and write it down. EXAMPLE: 15.6/1.6= 9.75miles

5. Circle the correct answer with the unit.

Students were given problem 5 A & B from their reading to try at home.