OMG Algebra is easy First an expression is

OMG! Algebra is easy. First, an “expression” is just a number sentence. For example, if you wanted to buy the Wii games and you didn’t know how much these games cost you could show this “number expression” by writing 3 x _____. The blank is there because it’s what you don’t know, the cost of each game. With algebra, instead of a blank you put a letter. It could be any letter. X, Z, G… Usually the letter is the first letter of the thing you talking about. So to write an algebraic expression you would write: 3 x C. 3 because you want 3 games and C because you don’t know the Cost of each game.

Mrs. Sweetland gives 3 bonus points for each extra-credit problem correctly completed. If b stands for the number of extra-credit problems correctly completed, which expression is equal to the total number of bonus points? • a. b x 3 A++ • b. b + 3 • c. b÷ 3 • d. b - 3 • e. 3 > b If because it just doesn’t go It is not e you guessed a, you are correct. Good for and By using the process with the problem you!!it doesn't make of any sense. elimination, a is the only answer left. But it is also correct because it makes sense and if you use it in It is not d the problem, would be takingthe because b-3 you should get away points, not right answer. adding them. It is not c because it doesn’t make sense in the problem and you would not be getting the full score if you divided it. And it is not b because once again, you would not be getting the full score if you added 3.

Find the value of y. x-y=y x = 10 D is the correct Since we know that We already know that • A. 32 answer! -22 y= number thing as 10 -32= thethe samecan’t be • • B. C. D. E. 16 4 5 2 10 -16= -6 10 -4=6 10 -5=5 10 -2=8 y, e and are takes negative. c. That not the answer. these two out.

You know how to find the sum of the angles of a polygon. The sum of the angles for a triangle (3 sides) is 180. The sum of the angles of a quadrilateral (4 sides) is 360. The sum of the angles of a pentagon (5 sides) is 540. If “S” is the amount of sides, which expression can be used to illustrate this way of finding the sum of the angles of any polygon. • • A. (S – 2) * 180 B. S + (2 + 180) C. 180 * S D. (360 x 2) This is correct because there 45 are 3 sides on a triangle. And We if we want toof the and need one get 180, subtract 2 from 3 sides, we numberup with 3 -2=1 1 x 180=180! end sentences over Not Correct there to equal what we Not Correct got for the angles on the 90 triangle. 45 Not Correct You add up the angles and the sum for any triangle is 180 90 45 45 180

120 90 90 100 90 You add up the angles and the sum for any square or rectangle or 4 sided figure and the sum is 360 90 90 Use what you learned from the 90 last slide to know that we take 4 90 -2 to get 2. Then take 2 x 180 to 90 get 360!! 360 100 110 Now all you have to do is 110 take the number of sides (5) 110 and subtract 100 Now take 3 2. 100 (the number you got) times 120 180 to get 540!! 540

180 360 720 Since the sum of a triangle is 180, all you have to do is find the triangles in the shape. 540

100 125 How much fencing is needed to go around the perimeter of this yard? + 75 50 125 65 +35 100 + 100 125 35 75 65 50 450 The answer to this problem is to Our last step to toto this problem to The first step this problem is: is add The next step this problem up is to find the last missing side. are. To find what the ? ’s on the picture all of the sides. If you do The perimeter is 450 feet!! this correctly, you we add have the and do this to the should 50 ft 65 ft To do that, top, we add and Do perimeter. get why? Discuss it with 35 ft. you 75 ft. your teacher.

100 50 ft 75 ft How much sod is needed to cover this yard? 65 + 35 100 What like to we that to To now. Ithe we do when the And since we know have And find thattop, have 2 75 ft shape isthe blue line To 65 not top add find shapes, side of ends where a square, is separateand 35 ft. can we the blue the we do the separate line, shape into 2 stops, find out that the start to we know what the same thing: We take or morenumber on the missing shapes. missing numbers are. the 50 and slide it blue line is 75. bottom of the over.

A buzz number… What could it be? A buzz number is a number that has less than 2 factors. Sounds confusing, huh? Well, It is not. If you were counting with buzz numbers included, you would start off like this. * * * 4 * 8 9 10 • 14 15 • 20 21 • 26 * * * 6 12 16 * 18 22 24 25 * 28 * * 30 * * • 32 33 34 35 36 • 38 * 40 * 42 * • 44 45 46 * 48 49 Remember, a buzz number has LESS than 2 factors. On this ppt. , they look like this- *.

One angle of a RIGHT triangle is 30 degrees. Which expression shows how to find the measure of the third angle? ? ? ? 30 90 A. 3* 180=A B. 3 * 90 + 60=A C. (360 / 3) - 90 D. 180 – 90 – 30=A

Calvin’s little brother jumped up and down. “Here they come!” shouted Calvin. Around the corner came the Thanksgiving Day Parade. Half of the people were on floats; 25% were in marching bands; clowns made up 1/8; tv stars made up 1/16; and there were 10 city officials, or 1/16. How many people were in the parade, and how many were in each group? Thanksgiving Parade Fraction Floats Marching Bands Clowns TV Stars City official s Total people Decimal Percent Whole Number/to tal number of people

About how much of each hour does a radio program schedule for weather? A. 1/10 B. B. 2/10 C. C. 3/10 D. D. 5/10 E. E. 10/10 How many minutes of each hour does a radio program schedule for weather?