# Number sense hspa prep ‘do now’ a review With Radicals and Exponents

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NUMBER SENSE HSPA PREP

DO NOW’ A Review With Radicals and Exponents (You should NOT need a calculator here.)

Do not leave any blank answers on the HSPA. While you practice, circle the number of any question where you guessed. After you check your answers with the answer key, you can go back and re-do these.
Circle the correct answer: (On this practice sheet you should always ‘show-your-work’).

1. What is + ?

A. 25 + 100 B. 5 + 10 C. 52 + 102 D. 50 + 10

1. Which choice is equivalent to + ?

A. 6 + 50 B. 36 + 25 C. 62 + 52 D. 11

1. What is (-4)2 +?

A. 16 + 5 B. 8 + 10 C. 16 + 7 D. 8 + 5

1. Try one more combination. What is -23 +?

A.-9+ 7 B. 8 + 7 C. -8 + 7 D. 6 + 7

1. Which of the following is not equal to 7?

A.+ B. 12 + 22 + 2 C. D. – 12

1. All of the following equal 16 except

A. 23 + (4) (2) B. C. 52 - 32 D. 62 – (10) (2)

1. (28) (28) = A. 28 B. 216 C. 232 D. 264

1. (83) 5 = A. 82 B. 815 C. 88 D. 8-2

8a. 65 63 = A 0 B. 1 C. 6 D. 62

1. (x4) (x4) = A. x8 B. x16 C. X0 D x-8

9a. (a4b3)2 A. (ab)9 B. a6b5 C. a8b6 D 2a4b3

1. (x2)5 = A. x3 B.x7 C. x10 D. x25

1. (x-3)2 = A. x5 B. x-1 C. x-5 D. x-6

1. (x-4) (x-4) = A. x8 B. x-8 C. x16 D. x-16

2. (x-4) = A. B. C. D. –x4 xo =

3. xo A. 0 B. 1 C. x D.

Algebraic Order of Operations: PEMDAS (parenthesis, exponents, multiply OR divide from left to right, add OR subtract from left to right)

***** Do NOT use a calculator to practice these examples! *****

15. 27 – 18 6

What do you do first? A. subtract B. divide

Evaluate the expression. A. 9 B. 24 C. 1.5 D. 25

16. 36 +18 2 x 3 - 8

What do you do first? A. add B. subtract C. divide D. multiply

Evaluate the expression. A. 96 B. 73 C. 32 D. 55

17. Evaluate the expression (72 9 -2) + 2 x 3

A. 12 B. 16 C. 24 D. 36

18. Evaluate the expression (20 + 8 4) + (32 x 4)

A.19 B. 43 C. 58 D. 71

19. Evaluate the expression [2(5-1) + 3(2 x 2)] – 4
A. 7 B. 16 C. 15 D. 20

20. Evaluate the expression (6-4)3 - 4

A. -5 B. 2 C. 4 D. 12
21. To evaluate this expression, what should you do first? (9 – 2 x 4) + 23(6)
A. 2x2x2 B. 9-2 C. 2(6) D. 2 x 4
22. Open-Ended Question:

Jaime says the evaluation of the following expression is 28, Billy says it is 24.

2(2 + 5 x 2)

When COMPARING numbers, put them in the SAME FORM first!

Example: Put these fractions and decimals in order from lowest to highest:

0.53

• One strategy would be to change all numbers to fractions with 100 as the denominator.

• 0.53 =

• = 1 divided by 4 = 0.25 which =

• = 3 divided by 5 = 0.60 which =

The correct order from smallest to largest is

Using the original numbers the correct order is 0.53

or

• Another strategy would be to change all numbers to decimals

0.53 = 1 divided by 4 = 0.25 = 3 divided by 5 = 0.60

The correct order is 0.25 0.53 0.60

Using the original numbers the correct order is 0.53

1. Jeff needs to find a drill bit just a little larger than ½ inch. Which would be the best one to choose? (Remember, you can change all to decimals to compare them easily.)

A. inch B. inch C. inch D. inch

24. Which of the numbers described below is the largest?
A. B. C. D.

25. Which of these numbers has the greatest number of different prime factors?

A. 30 B. 50 C. 99 D. 121

Strategies when doing Multiple Choice Questions:

• Read each question carefully and underline or circle the final answer.

• Write down your work (even if you use a calculator). Be careful when you press calculator keys; don’t rush!

• Check your work (use the calculator)

26. The regular price of a pair of sneakers is \$79.00. They are on sale for 15% off. If Jose buys them on sale, how much change will he get from \$70?

1. \$ 9.00 B. \$ 2.85 C. \$ 3.85 D. \$ 67.15

Open-Ended Question:
27. Pete takes excellent care of his new car. He takes it to his local service station and rotates the tires every 2,000 miles, and gets the oil changed every 1,500 miles.

• If he owned the car since it was new and it now has 20,050 miles on it, how many trips to the service station did he make to rotate the tires and change the oil?

1. Open-Ended Question:

The new Office Supply Store is having a grand opening sale. They are giving away a free calculator to every 5th person who enters the store and a packet of blank CDs to every 3rd person.

• If 120 people entered the store by noon, how many would receive both the free calculator and the free packet of CDs?

RATIO AND PROPORTION
29. The Algebra class of 24 students contains 16 boys. What is the ratio of boys to girls?
A. 1:2 B. 2:1 C. 2:3 D. 3:1

30. In the above class of 24 students, what is the ratio of girls to all the students in the class?

A. 1:2 B. 1:3 C. 1:4 D. 3:1

1. In a mailing survey 30 out of 750 questionnaires were returned. Write the ratio of questions returned to questions mailed.

A. 1:25 B. 24:25 C. 1:24 D. 1:4

32. Write the ratio of the number of black 3s to the total number of black cards in a regular deck of playing cards.
A. 1:13 B. 1:26 C. 1:52 D. 2:13

33. A summer league softball team won 28 out of the 32 games they played. What is the ratio of games won to games played?

A. 4:5 B. 3:4 C. 7:8 D. 2:3

34. A family has a monthly income of \$2,050, but they spend \$1,200 a month on rent. What is the ratio of the amount of income to the amount paid for rent?

A. 41:24 B. 8:6 C. 24:41 D. 6:8
35. What fractional part of a week is 98 hours?
A. B. C. D.

36. The Italian class has 12 boys and 18 girls. Boys are what fraction of the class?

A. B. C. D.

37 From 2004-2005 the number of applicants to a nearby college increase 15% to 5,060 students. How many applicants were there in 2004?

A. 759 B. 4,301 C. 4,400 D. 5,819

38. Open-Ended Question

The population of a town doubled every 10 years from 1960 to 1990. What was the percentage increase in the population during this time? (Show your work!)

Hint: Make a chart or table, label the headings and begin with any number that is easy to work with.

39. In January the value of a particular stock increased by 25%; in February it decreased by 20%. How did the value of the stock at the end of February compare with its value at the beginning of January?

(Hint: Select an easy number for the stock price before January. Use your calculator to avoid a careless mistake. Show your work. Label your work as you write. Do not rush when plugging numbers into the calculator.)
A. It was the same.

B. It was less.

C. It was more.

D. It was 5% greater.

Open-Ended Questions

• These questions are scored by hand. The people scoring them work very hard all day reading hundreds of student answers. It is difficult for them to spend extra time trying to figure out what you have written. It is important to be neat and to write clearly. Put a bullet or circle around your answers. In mathematics, using a table or a chart to outline information is often better than writing a long paragraph.

• Even if you cannot answer all parts of the question, answer as much as you can. Every point counts. You must get some points on the open-ended questions if you are to receive a proficient (passing) score on the HSPA. Open-ended questions are worth 3 points. You can receive 0, 1, 2 or 3 points; partial credit is given.

40. At the end of week #2 of her new part-time job, Allison earned \$110, which is a 25% increase over week #1. How much did she earn her first week?

Use your calculator to avoid a careless mistake. Show your work. Label your work as you write. Do not rush when plugging numbers into the calculator.)
.

41. If a coat is priced at \$85 and is reduced by 10% each day, when will Sarah be able to buy the coat if she has \$60.00? Remember, most open-ended GEPA questions can be answered using a chart or table.

 Each day Work shown (computation done with calculator but “work” is still written here) Price Original price of coat \$ 85.00 Sarah will be able to buy the coat on

42. Four local gas stations each advertise that they have the lowest prices in the area. Marco and his dad drove to each station and filled up the tanks of five different cars.

Use the chart below as a guide:

## Total cost

Number of gallons

Alco

\$ 18.24

9.5

Bright

\$ 18.31

9.2

Custom

\$ 17.02

8.3

Dixon

\$ 16.80

8

Extra

\$18.45

9

• Which gas station really has the lowest price? Explain.

• If Marco purchases 20-gallons at the lowest price, how much would he save instead of going to the most expensive gas station?

43. The Sweater Barn in an upstate NY mall and the Teen Outlet in New Jersey are both having big sweater sales.

 Two-Piece Sweater Sets Sweater Barn (NY) Sweater \$24 less 15% Matching cardigan is 50% off of the sweater sale price. Teen Outlet (NJ) Sweater \$18 less 10% Matching cardigan is the same price as the sweater.

Maria wants to purchase three sets as birthday gifts for her nieces. She notices that the New York State store charges 8% sales tax on clothing and New Jersey has no sales tax on clothing.

• What will the 3 sets cost at the Sweater Barn in New York?

• What will the 3 sets cost at the Teen Outlet in New Jersey?

• Which is the better buy? Explain.

ANSWER KEY 1- Number Sense HSPA PREP

1. B 2. D 3. A 4. C 5. D 6. B
7. B 8. B 8a. D 9. A 9a. C 10. C
11. D 12. B 13. A 14. B
15. B divide, B 24
16. C divide, D 55
17. A 12 18. C 58 19. B 16 20. C 4
21. D 2x4 (Work inside parenthesis first.)
22. Billy is correct 2(2 + 5 x 2) = 2(2 + 10) = 2(12) = 24
23. D 9/16 Here, I made fractions with a common denominator and then I compared the numerators ½=16/32 … ¼=8/32 3/8=12/32 5/32 9/16=18/32
24. D 1/10
25. A 30 (5)(3)(2) are the three different prime factors of 30

(11)(3) (3) are the prime factors of 99, but only two are different.

(5) (5) (2) are the prime factors of 50, but only two are different.

121 is a perfect square number; (11) (11) = 121
26. Read the question part of the example twice to be sure you understand what is being asked.

• First, determine the sale price.

(\$79)(0.15) (this is the % off) = \$11.85; 79.00 – 11.85 = \$67.15 (sale price)

or

(79)(0.85) (this is the % he would pay) = \$67.15 (sale price)

• Now, determine the change he would receive from \$70.00

70.00 – 67.15 = \$2.85 (change from \$70)

(Watch your computation, a careless error might make you select 3.85)

• The correct answer is B \$2.85 (The change he would receive.)

27. I needed to find the common multiples of 1,500 and 2,000 to see when Pete would be getting his tires rotated and his oil changed on the same trip.
Tires: 2,000miles 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 2,2000
Oil: 1,500miles 3,000 4,500 6,000 7,500 9,000

10,500 12,000 13,500 15,000 16,500 18,000

19,500 2,100
Pete would make 7 trips for tire rotation only.

10 trips for oil change only

3 trips for tire rotation and oil change on the same day

20 trips in all

Final answer: He would make a total of 20 trips.

28. This is very similar to question #27 above. Here I needed to find common multiples of 3 and 5 from 1 to 120. First I listed the multiples of “5” and then I bolded (or circled) the multiples of 5 that also were multiples of 3.
Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120

Or

I could have listed the multiples of 3 first. But, that would have been more time-consuming and more difficult. Counting by 5’s is much easier.

Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99, 102, 105, 108, 111, 114, 117, 120
Final answer: From either set of listed multiples above, I can see that there would be 8 people who would receive the free calculator and the free CDs.
32. Since there are only 2 black 3s, and only 26 black cards in all (13 spades and 13 clubs)

37. The new amount is 115% of the original. (1.15)(x) = 5,060; x = 4,400 answer C

38. I chose to begin with an easy number; I chose 100. 1960 = 100

1970 = (100) (2) = 200

1980 = (200) (2) = 400

1990 = (400) (2) = 800

Answer: There is a 700% increase in population of the town from 1960 to 1990.
Check: (\$100) (700%) = (\$100) (7.00) = \$700; \$100 + \$700 = \$800; check!

39. Here I began with an easy number, \$100.

Beginning value: \$ 100

January (100) (.25) = \$25.00; \$100 + 25 = \$ 125 or (100)(1.25)=\$125

February (\$125)(.20)= \$25.00; \$125 – 25 = \$ 100 or (125)(0.80)=\$100

Answer: A, They are the same.

40. Second week = \$110 \$110 is 125% of the first week

110 = (1.25) (week #1)

110 = 1.25x

= x

Answer: She earned \$88 the first week.
Check: 125% of 88 = (1.25) (88) = \$110. Correct!
41. Check your answers and work-shown against this chart. How do you think you would have been scored here? Would you have received full credit (3 points), 2 points, 1 point, or no points?
 Each day Work shown (computation done with calculator but “work” is still written here) Price Original price of coat \$85.00 Day #1 of sale coat is 10% less 100%-10% = 90%; She pays 90% (85) (.90) = 76.50 Day #2 of sale (76.50) (.90) = 68.85 Day #3 of sale (68.85) (.90) =- 61.965 or 61.97 Day #4 of sale (61.97) (.90) = 55.768 or 55.77 Sarah will be able to buy the coat on day #4 of the sale. On that day it will cost \$55.79 (or less than \$60.00)

42.

• Alco is the least expensive. Gas at Alco costs \$1.92 per gallon.

Work shown

Total price number of gallons = price per gallon

18.24 9.5 = \$1.92 per gallon Alco

18.31 9.2 = \$1.99 per gallon Bright

17.02 8.3 = \$ 2.05 per gallon Custom

16.80 8 = \$ 2.10 per gallon Dixon

• Marco would save \$3.60.

20 gal 2.10 = \$42.00 most expensive (at Dixon’s)

20 gal 1.92 = 38.40 least expensive (at Alco’s)

savings: \$ 3.60 (I subtracted to find the difference.)

43.

Sweater Barn at the upstate New York mall where there is an 8% sales tax on clothing:

Cost for sweater: \$24 less 15% is same as 24 x 0.85 = \$20.40 per sweater

Cost for cardigan: \$20.40 x 50% is (1/2 of \$20.40) = \$10.20 per cardigan

• Total cost for one sweater and one cardigan before taxes = \$30.60 per set

Three sets = (3) (30.60) = \$ 91.80

• Total for 3 sets w/sales tax = (1.08)(91.80) = \$ 99.15 (\$99.14 also accepted as correct) total with sales tax

Teen Outlet in New Jersey (where there is no sales tax on clothing):

Cost for sweater: \$18 less 10% = \$16.20 for each sweater

Cost for cardigan: Each cardigan is the same price = \$16.20 per cardigan

• Total cost for one sweater and one cardigan = (2) (16.20) = \$32.40 per set

• Total for 3 sets = (3) (32.40) = \$97.20 total

This would be the final price since there is no sales tax on clothing in New Jersey.

• The Teen Outlet store in New Jersey would be a slightly better buy. The cost at the New Jersey store would be \$1.95 (or \$1.94) less than the New York store.

NUMBER SENSE HSPA PRACTICE 4/21/2016 Page of

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