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# Grade 5 Everyday Math Lesson 9.5

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### Grade 5 Everyday Math 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!