8.1 DEllen and Tanzia entered a math contest where this year’s topic is scientific notation.

They were given the following numbers and asked to: 387,000,000 1,286,0000.000567 721,0000.0000258 0.00954

•write the numbers in scientific notation (25 points)•put them in order from least to greatest (in scientific notation) (15 points) •pair the two numbers together that will have the smallest sum (5 points)•pair the two numbers together that will have the largest range (5 points)

Ellen Tanzia

a 3.87 x 108 1.286 x 106

5.67 x 10-4 7.21 x 105

2.58 x 105 9.54 x 10-3

3.87 x 108 1.286 x 106

5.67 x 10-4 7.21 x 105

2.58 x 10-5 9.54 x 10-3

b 1) 1.286 x 106 4) 5.67 x 10-4 2) 3.87 x 108 5) 7.21 x 105

3) 2.58 x 105 6) 9.54 x 10-3

1) 2.58 x 10-5 4) 7.21 x 105

2) 5.67 x 10-4 5) 1.286 x 106

3) 9.54 x 10-3 6) 3.87 x 108

c 1.286 x 106 & 3.87 x 108 5.67 x 10-4 & 2.58 x 10-5

d 9.54 x 10-3 & 1.286 x 106 3.87 x 108 & 1.286 x 106

Their answers are shown in the table to the right. Determine the winner of the contest by calculating the number of points earned by each student. No partial credit will be given. Justify your answer.

Region IV- Obj. 1

8.2 AEach month Kevin saves

21

of the money he makes working part time at The Shoe Warehouse. Over the next 12 months he would like to save $1750 for a down payment on a car. At The Shoe Warehouse, he makes $50 a month plus 10% commission on his sales. On average he sells $2300 a month in ladies shoes. At this rate, how many more months does Kevin need to work to have the down payment for his car? Justify your answer.

8.2 AYou borrowed $99 from your mom to buy a dress for the school dance. You plan on babysitting to earn the money to pay her back. If you earn $5.50 an hour, and you can only work 4 hours a week babysitting, then how many weeks will it take you to pay back the money? Justify your answer.