Grade 7 Sample Final Exam Answer Key

5. Natasha takes $80 to the mall to buy gifts. She spends $28.75 on a DVD. She wantsto purchase a magazine for $8.99 and a purse for $43.49. Does she have enoughmoney to buy the purse and magazine? Justify your answer.80 – ( 28.75 + 8.99 + 43.49 ) -1.23The negative $1.23 indicates that Natasha does not have enoughmoney. There are other ways to solve this, but all ways shouldresult in Natasha being $1.23 short.[2 marks]6. Dennis’ parents left him alone for the weekend and for three days the only thing heate was pizza. On Friday he ate of a pizza, on Saturday he ate another of a pizza,and finally on Sunday he ate of a pizza. How much pizza did Dennis eat thatweekend?[3 marks]+ + 1 pizzas that Dennis ate that weekend.7. Alex decides to use a two pan balance model to solve the equation 3x – 9 -6.Fill in the boxes with the missing steps and determine the value of x.[2 marks]3x – 9 -6+9 +93x – 9 -63x+3x+1Grade 7 Math Final Exam (Sample Answer Key) June 2009 Page 4

8. Sarah has 3 pairs of shorts (blue, green, and white), and 2 tops (blue and white).A) If Sarah wants to pick out a top and a pair of shorts to wear, draw a diagram ortable to identify the sample space (a list of all possible outcomes)? [2 marks]OrSample Space { BB, BG, BW, WB, WG, WW }B) Sarah decides to choose a top and a pair of shorts without looking. What is theprobability that she will pick shorts and a top that are the same colour?[1 mark]9. Construct the perpendicular bisector of the line segment . [2 marks]Since there are several methods forstudents to choose from teachersshould apply their judgement here.ABGrade 7 Math Final Exam (Sample Answer Key) June 2009 Page 5