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# Everyday Mathematics Grade 5 Lesson 9.5

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To be used with Lesson 9.5 Everyday Mathematics for Grade 5. How to find the are of non-rectangles.

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### Everyday Mathematics Grade 5 Lesson 9.5

1. 1. Personal references 1cmEveryday objects that give us an idea about standard measurements.
2. 2. Last time, you used TWO different methods to find the area of a rectangle. What were they? Don’t panic!
3. 3. Working by yourself or with a partner, go through page 309.Try out some different ways of finding the area of non-rectangles. Then, let’s chat about it!
4. 4. What were some strategies that worked?
5. 5. Strategy 1: Add the parts!1. Split into right triangles.2. Turn it into a rectangle.3. Find the area.4. Divide by 2.5. Add the parts!
6. 6. Strategy 2: Subtract the Excess!Sometimes, you can’t split a triangle into nice right triangles. So we need another method.
7. 7. Strategy 2: Subtract the Excess!1. Make a rectangle around the wholetriangle.2. Find the area of the parts.3. Find the area of the green triangle:use the strategy we just learned. Draw a square. Find the area. Divide by 2. 4. Subtract the parts from the whole!!
8. 8. Strategy 2: Subtract the Excess! (for parallelograms)1. Make a rectangle around the wholetriangle.2. Find the area of the parts.3. Find the area of the blue andgreen triangles: use the strategy wejust learned. Draw a square. Find the area. Divide by 2. 4. Subtract the parts from the whole!!
9. 9. You try it!Practice on page 310.When you finish, check your workwith another student.Then, play Frac-Tac-Toe!