7th Grade MATH Week of 12/15

Monday : Bell Work Study quietly by yourself for the test. We will begin in a few minutes. You may show work on the test. Put your answers on the bubble sheet. When done- You may read or complete work but you must BE QUIET!!

Tuesday : Bell Work Use percent of change to answer this problem Show your work If the price of a purse increased from $45 to $54, what was the percent of increase?

Agenda 1- bell work 2- Agenda 3- Objective 4- lesson *Simple Interest 5- exit ticket

Lesson objective 7. RP.3 Use proportional relationships to solve multistep ratio and percent problems.

Simple Interest Lesson 6-7 Interest is the amount of money that is charged for borrowing or using money. Simple Interest is money paid only on the principal. Principal is the amount of money deposited or borrowed.

Simple Interest Lesson 6-7 It does matter which letters are capital and lower case!! Pay careful attention.

Simple Interest Lesson 6-7 Units of Measure I = $ P= $ r= % t= years

Example

Textbook p. 364 Let’s look at #1 I = , P = $300, r = 4%, t = 2 years Formula: I = Prt (I party) I = 300 x 4% x 2 I = $ 24

Textbook p. 364 Let’s look at #3 I = $120, P = , r = 6%, t = 5 years Formula: I = Prt (I party) 120 = P x 6% x 5 120 = P x 0.3 0.3 0.3 $400 = P

Exit Ticket Partner Discussion: When would you interest in real life?

Wednesday: Bell Work Use percent of change to answer this problem Show your work A DVD movie originally cost $24.99. Its current price is $19.99. What is the percent of change rounded to the nearest percent?

Benchmark Review The benchmark tested 10 skills.

Skills 1) Spi 0706.1.1 questions 19, 20 2) Spi 0706.2.1 questions 5, 6, 7 3) Spi 0706.2.2 questions 1, 2 4) Spi 0706.2.5 questions 3, 4, 26 5) Spi 0706.2.7 questions 25, 27 6) Spi 0706.3.1 questions 8, 9, 10 7) Spi 0706.3.5 questions 21, 22, 23, 24 8) Spi 0706.3.6 questions 11, 12, 13 9) Spi 0706.3.7 questions 14, 15, 16 10) Spi 0706.3.8 questions 17, 18

Spi 0706.1.1 questions 19, 20 use proportions to solve problems 19. A recipe for making 5 cups of soup requires 4 cups of water. At this rate, how many cups of water are required to make 40 cups of soup? A. 8 cups B. 20 cups C. 32 cups D. 50 cups 20. A 8 ounce bag of trail mix contains 5 ounces of peanuts. At the same rate, how many ounces of peanuts would be contained in a 20 ounce bag of trail mix? E. 40 F. 32 G. 12.5 H. 2.5

Spi 0706.2.1 questions 5, 6, 7 simply expressions w/ rational #s

Spi 0706.2.2 questions 1, 2 compare rational #’s w/ inequalities

Spi 0706.2.5 questions 3, 4, 26 contextual problems w/ integers 3. The temperature at 9:00 a.m. was –6°C. The temperature increased 10°C between 9:00 a.m. and noon, but thendropped 7°C by 6:00 p.m. What was the temperature at 6:00 p.m.? A. –9°C B. –3°C C. 11°C D. 23°C

4. The temperature in San Diego was 71°F, while the temperature in Chicago was ¯12°F. How many degrees warmer was it in San Diego than in Chicago? E. 59ºF F. 61ºF G. 69ºF H. 83ºF 26. A department store is having a sale. Skirts are on sale for 20% off the original price, p. Which equation could be used to find s, the sale price of a skirt? E. s = 0.20p F. s = p – p / 20 G. s = p – 0.20 H. s = p – 0.20p

Spi 0706.2.7 questions 25, 27 use proportions to solve problems 27. It took a race car driver 3 hours and 15 minutes to go 500 miles. What was his mean rate of speed, to the nearest tenth of a mile per hour? A. 142.9 mph B. 153.8 mph C. 158.7 mph D. 166.7 mph

Spi 0706.3.1 questions 8, 9, 10 evaluate algebraic expressions 8. If r = 3 and s = –6, what is the value of the expression 8r + 3s? E. –39 F. –6 G. 6 H. 39 9. What is 12m2 when m = 4? A. 28 B. 96 C. 192 D. 2304

10. If x = –1.17 and y = –0.4, what is the value of the expression –3x + 1.5y? G. 2.91 H. 4.11

Spi 0706.3.5 questions 21, 22, 23, 24 represent proportional relatinships 21. Suki typed 245 words in 3 ½ minutes. What is Suki’s typing rate? A. 35 words per minute B. 70 words per minute C. 82 words per minute D. 86 words per minute

**This problem will be taught next quarter!!! 22. Which table has numbers which show a proportional relationship between x and y? E. G. F. H.

23. The table below shows the amount of money Sarah earns babysitting for different numbers of hours. Which equation best represents Sarah’s total earnings for babysitting? A. y = 5x B. y = -5x + 20 C. y = 5x + 5 D. y = 5

Spi 0706.3.6 questions 11, 12, 13 solve linear equations 11. What is the value of n in the equation 4n + 4 = –32? A. –9 B. –7 C. 7 D. 9 12. What value of x makes the following equation true? E. 6 F. 8 G. 12 H. 24

Spi 0706.3.7 questions 14, 15, 16 translate between words and math 14. Which word phrase translates into the algebraic expression 2(x + 2)? E. two x increased by two F. twice x increased by two G. twice the sum of x and two H. two times the product of x and two

15. A 1-ounce serving of cheddar cheese has 115 calories, which is 20 calories more than a 1-ounce serving of Swiss cheese. If s is the number of calories in a 1-ounce serving of Swiss cheese, which of the following equations best represents this situation? A. 20s=115 B. s + 20 = 115 C. s – 115 = 20 D. s + 20 + 115 = 0 16. The cost of one movie ticket for an adult is 1.6 times the cost of a ticket for a child. If a equals the cost of one adult ticket and c equals the cost of one child ticket, which equation represents the relationship between a and c? E. a = 1.6c F. c = 1.6a G. 1.6 = a + c H. 1.6 = a - c

Spi 0706.3.8 questions 17, 18 solve contextual problems w/ equations 17. Helga bought 7 vases of flowers. Each vase contains an equal number of flowers. She also bought 6 single roses. Altogther there are a total of 90 flowers. The equation below can be used to find f, the number of flowers in each vase. 7f + 6 = 90 How many flowers are in each of the vases? A. 13 B. 12 C. 7 D. 6

18. Tony is ordering T-shirts for Art Club 18. Tony is ordering T-shirts for Art Club. The shop charges a $50 printing fee and $6 per shirt ordered. He sepnt $206 on the shirts. The equation blow can be used to find n, the number of t-shirts ordered. 6n + 50 = 206 How many t-shirts were ordered? E. 42 F. 26 G. 10 H. 4

Exit Ticket What could you have done to improve your grade on the benchmark?

Thursday: Bell Work Use percent of change to answer this problem Show your work Mary decreased her time in the mile walk from 30 minutes to 24 minutes. What was the percent of decrease?

Exit Ticket Have a great break!