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Interactive video lesson plan for: How to solve basic percent word problems, part 2

Activity overview:

In this part 2 of the lesson, we first find what percentage the area of one triangle is of the are of the other. Of course, to find the percentage, we simply write the fraction PART/TOTAL, and then convert that to a percentage.

Then we solve a problem involving an overtime pay that is 160% of the normal.

The last problem states, "3.1 is 14% of what number?" - a typical algebra textbook problem. Essentially, we need to find the TOTAL when the part and the percentage are known. One way to do that is to use the little "formula" PART/TOTAL = PERCENTAGE. In this case, we get 3.1/x = 0.14 or 3.1/x = 14/100, and it's easy to solve the latter equation with cross-multiplying.

The 1st part of this lesson, where we deal with discounts and with a price increase, is at https://www.youtube.com/watch?v=3zIF_To_XHs

This lesson is meant for grade 7 math and for pre-algebra.

Tagged under: percentage,percent problems,percent word problems,grade 7,math,pre-algebra

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