Step: 1

Number of people attended the circus last Sunday = 603

Step: 2

The average cost of a ticket = $19

Step: 3

Estimated amount of money collected = number of people who attended × cost of ticket

Step: 4

= 603 × 19

Step: 5

= 600 × 20

[Round each number in the product to the nearest 10.]

Step: 6

= 12,000

[Simplify.]

Correct Answer is : $12,000

Step: 1

Total number of members in the college = 350+12 = 362

Step: 2

Round down 362 to 360 .

Step: 3

Number of people that can be accommodated in a bus = 22.

Step: 4

Round down 22 to 20.

Step: 5

Number of buses needed = Number of members of the college ÷ Number of persons a bus can accommodate.

Step: 6

Step: 7

About 18 buses are needed for the trip.

Correct Answer is : 18

Step: 1

Actual total number of stickers = Number of stickers × Number of stickers in each pack

Step: 2

= 29 × 18 = 522

[Substitute the values and multiply.]

Step: 3

Estimated number of stickers = 30 × 20 = 600

Step: 4

Beth's estimate would be more as she rounded up both the numbers.

Correct Answer is : More, because she rounded both numbers up.

Step: 1

Score for each target she hits is 63 points, round down to 60 points.

Step: 2

Number of targets hit is 21, round down to 20.

Step: 3

Total points she scored = Points she scores for each target × Number of targets

Step: 4

= 60 × 20 = 1200

[Substitute the values and multiply.]

Step: 5

As we are rounding down both the values, actual total points she scored are more than estimated total points.

[Substitute the values and multiply.]

Step: 6

So, the total points that she scored are more than 1200.

Correct Answer is : Marta scored more than 1,200 points.

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

Bryan earnings per match = $140

Step: 2

Number of matches he plays per season = 62 to 65 = 60

[Round down to 60.]

Step: 3

Estimated earnings = 140 × 60 = $8400

[Earnings per match × Number of matches he plays.]

Step: 4

Bryan's estimated earning per season = $8300

Step: 5

Bryan's estimation is less than Actual estimation.

[$8300 < $8400.]

Step: 6

So, Bryan under estimated his seasonal earnings.

Correct Answer is : Bryan under estimated his earnings.

Step: 1

To estimate how much money Ray needs, he should first approximate the amount $19.

Step: 2

Approximating $19 can be done using a number line as shown below.

Step: 3

Represent the number 19 on a number line.

Step: 4

From the number line, 19 is closer to 20 than 10, 15, or 18.

Step: 5

So, Ray should round up 19 to 20.

Correct Answer is : round up 19 to 20.

Step: 1

Round down 423 to the nearest hundred = 400

Step: 2

Round up 978 to the nearest hundred = 1000

Step: 3

400 + 1000 = 1,400

[Add the rounded values.]

Step: 4

So, the amount in Arthur's account is about $1,400.

Correct Answer is : $1,400

Step: 1

The product 37 × 25 is

Step: 2

3 | 7 | ||

× | 2 | 5 | |

1 | 8 | 5 | |

7 | 4 | ||

9 | 2 | 5 |

Step: 3

So, the product of 37 and 25 is 925.

Step: 4

The product 40 × 30 is

Step: 5

4 | 0 | |||

× | 3 | 0 | ||

0 | 0 | 0 | 0 | |

1 | 2 | 0 | ||

1 | 2 | 0 | 0 |

[Carl′s estimation for 37 × 25 is 40 × 30.]

Step: 6

So, the product of 40 × 30 is 1200.

Step: 7

The product of 40 × 30 is greater than the product of 37 × 25.

[1200 > 925.]

Step: 8

So, the statement 'Estimation of the product 37 and 25 is greater than the exact answer' is true.

Correct Answer is : Estimation of the product of 37 and 25 is greater than the exact answer.

Step: 1

As Anna spent minimum of $22 each week, its nearest value to tens is $20.

Step: 2

Maximum amount spent by her is $38 and its nearest value to tens is $40.

Step: 3

For 8 weeks, Anna's minimum expenses are $20 × 8 = $160.

Step: 4

For 8 weeks, Anna's maximum expenses are $40 × 8 = $320.

Step: 5

Therefore, among the choices, between $160 and $360 is correct.

Correct Answer is : between $160 and $360

Step: 1

As Lehman puts a minimum of 43 oranges in each carton, its nearest value to tens is 40.

Step: 2

He puts a maximum of 49 oranges in each carton and its nearest value to tens is 50.

Step: 3

In 10 cartons, the minimum number of oranges kept by Lehman is 40 × 10 = 400.

Step: 4

In 10 cartons, the maximum number of oranges kept by Lehman is 50 × 10 = 500.

Step: 5

Therefore, **Lehman puts between 400 and 500 oranges in 10 cartons**.

Correct Answer is : between 400 and 500

Step: 1

Number of pages she can type = Number of pages can be typed in an hour × Number of hours

Step: 2

= 10 × 20

[Round down 11 to nearest whole number 10 and 21 to nearest whole number 20.]

Step: 3

The best estimate of the number of pages she can type can be found by multiplying 20 and 10.

Correct Answer is : multiply 20 and 10

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