Step: 1

Number of shelves in a music store = 58.

Step: 2

Number of CDs in each shelf = 42.

Step: 3

Round up 58 to 60 and round down 42 to 40.

Step: 4

Total number of CDs in the music store = number of shelves × number of CDs in each shelf

Step: 5

= 60 × 40 = 2400

[Substitute the values and simplify.]

Step: 6

Therefore, total estimated number of CDs in the store is 2,400.

Correct Answer is : 2,400

Step: 1

Number of postcards that Sean bought from Canada = Total number of postcards - Number of postcards from Sweden and Hungary

Step: 2

= 768 - 342

Step: 3

= 770 - 340 = 430

[Round 768 and 342 to the nearest 10 and subtract the rounded values.]

Step: 4

The number of postcards bought from Canada rounded to the nearest ten, is 430.

Correct Answer is : 430

Step: 1

Round 12 down to 10 and 9 up to 10.

[Round to nearest multiple of 10.]

Step: 2

Time taken = 10 × 10 = 100

[Multiply.]

Step: 3

So, estimated time taken to decorate a vase 9 times is 100 minutes.

Correct Answer is : 100

Step: 1

Round 19 to 20 and 9 to 10.

[Round to nearest multiple of 10.]

Step: 2

Time taken by Robert to prepare 9 flower beds is about "20 × 10 = 200" minutes.

Correct Answer is : 200 minutes

Step: 1

Round 12 to 10 and 47 to 50.

[Round to nearest multiple of 10.]

Step: 2

Total number of students in the school = 10 × 50 = 500.

Correct Answer is : 500

Step: 1

Frank traveled 576 and 326 miles on two consecutive days.

Step: 2

576 + 326 is about 580 + 330.

[Rounded to nearest 10]

Step: 3

= 580 + 330

Step: 4

= 910

[Add]

Step: 5

Frank traveled a total distance of 910 miles on the two days together.

Correct Answer is : 910

Step: 1

Amount the museum collected on that day = Average price of the ticket × Number of people who visited the museum.

Step: 2

= $29 × 543.

Step: 3

$29 can be rounded to $30.

Step: 4

543 can be rounded to 540.

Step: 5

So, $30 × 540 = $16,200.

Step: 6

So, $16,200 is the correct answer.

Correct Answer is : $16,200

Step: 1

An estimate is enough to find the number of groups that can be made with 59 students.

Step: 2

Number of students in each group = 5

Step: 3

Total number of students in the class = 59

Step: 4

59 can be rounded to 60.

[Round 59 to nearest ten.]

Step: 5

Number of groups that can be made with the given number of students = Total number of students rounded to nearest ten ÷ Number of students in each group

Step: 6

= 60 ÷ 5 = 12

[Divide 60 by 5.]

Step: 7

Therefore, the estimated number of groups that can be formed is 12.

Correct Answer is : 12

Step: 1

Round 17 up to 20 and 12 down to 10.

[Round to nearest multiple of 10.]

Step: 2

Number of pencils = 20 × 10

[Multiply.]

Step: 3

So, Wilson bought about 200 pencils.

Correct Answer is : 200

Step: 1

Round up 289 to the nearest hundred = 300

Step: 2

Round down 120 to the nearest hundred = 100

Step: 3

300 + 100 = 400

[Add the rounded values.]

Step: 4

So, the estimated number of letters written are about 400.

Correct Answer is : 400

Step: 1

Amy has collected 831 marbles.

Step: 2

Round down 831 to 800.

[Rounded to the nearest 100.]

Step: 3

She wants to collect 1,000 marbles.

Step: 4

So, the number of marbles she needs to collect = 1,000 - 800 = 200.

Correct Answer is : 200

Step: 1

John wants to pack 5 oranges in each box and he has 38 oranges.

[Given.]

Step: 2

38 can be rounded to 40.

Step: 3

Number of boxes required = Estimated number of oranges ÷ Number of oranges in each box.

Step: 4

= 40 ÷ 5 = 8

Step: 5

Therefore, John needs about 8 boxes to pack all the oranges.

Correct Answer is : 8

Step: 1

Ursula wants to use 4 roses in each bouquet and she has 77 roses.

[Given.]

Step: 2

77 can be rounded to 80.

Step: 3

Number of bouquets = Estimated number of roses ÷ Number of roses in each bouquet.

Step: 4

= 80 ÷ 4 = 20

Step: 5

Therefore, Ursula can make about 20 bouquets by using 77 roses.

Correct Answer is : 20

Step: 1

Number of points for each round = 33

Step: 2

33 points can be rounded as 30 points.

[Round to the nearest tens.]

Step: 3

Number of rounds played = 9

Step: 4

Number of rounds won by Paula = 6

Step: 5

Points earned by Paula at the end of the game = Number of points earned by Paula in each round × Number of rounds she won

Step: 6

= 30 × 6

Step: 7

= 180

Step: 8

Therefore, Paula earned 180 points in the game.

Correct Answer is : 180

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