Step: 1

Round down 812 to the nearest hundred = 800

Step: 2

Round up 582 to the nearest hundred = 600

Step: 3

800 + 600 = 1,400

[Add the rounded values.]

Step: 4

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

Correct Answer is : $1,400

Step: 1

Round up 472 to the nearest hundred, 500.

Step: 2

Round down 318 to the nearest hundred, 300.

Step: 3

500 + 300 = 800

[Add the rounded values.]

Step: 4

So, Maura gave about $800.

Correct Answer is : $800

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

Round down 202 to the nearest hundred = 200

Step: 2

Round down 303 to the nearest hundred = 300

Step: 3

200 + 300 = 500

[Add the rounded values.]

Step: 4

So, the total distance traveled by John is about 500 miles.

Correct Answer is : 500 miles

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

The amount of money Jake spends every month = Jake′s earnings - Jake′s savings.

Step: 2

= 8,265 - 3,325

[Substitute.]

Step: 3

= 8300 - 3300

[Round to the nearest hundred.]

Step: 4

= 5000

[Subtract.]

Step: 5

Therefore, Jake spends about $5,000 every month.

Correct Answer is : $5,000

Step: 1

Marv wants to collect $1,000.

Step: 2

$870 rounded to the nearest hundred is $900.

[Marv has collected $870 for a relief fund.]

Step: 3

So, the estimated amount he still needs to collect = $1,000 - $900 = $100.

Correct Answer is : $100

Step: 1

Aunt's house is 1,000 mi away from Eric's house.

Step: 2

He already traveled 560 mi.

Step: 3

Round up 560 mi. to 600 mi.

[Round up 560 to the nearest 100.]

Step: 4

So, the distance he has to travel = 1,000 - 600 = 400 mi.

Correct Answer is : 400 km

Step: 1

8,996 rounded to the nearest thousand is 9000.

5,524 rounded to the nearest thousand is 6,000.

5,524 rounded to the nearest thousand is 6,000.

Step: 2

The amount of money left in the bank = the amount of money George deposited - the amount of money he withdrew.

Step: 3

= 9000 - 6000

[Substitute the rounded values.]

Step: 4

= 3000

[Subtract.]

Step: 5

So, George has about $3,000 left in the bank.

Correct Answer is : $4,000

Step: 1

Round down 12 to the nearest ten = 10

Step: 2

Round up 26 to the nearest ten = 30

Step: 3

10 + 30 = 40

[Add the rounded values.]

Step: 4

So, the amount of money Justin spent is about $40.

Correct Answer is : $40

Step: 1

Round down 93 to the nearest ten, 90.

Step: 2

Round up 37 to the nearest ten, 40.

Step: 3

90 - 40 = 50

[Subtract the rounded values.]

Step: 4

So, Paula left with $50.

Correct Answer is : $50

Step: 1

Number of girls in the school = 346.

Step: 2

346 rounded to the nearest ten is 350.

Step: 3

Number of boys in the school = 254.

Step: 4

254 rounded to the nearest ten is 250.

Step: 5

Total number of students = 350 + 250

[Substitute the rounded values.]

Step: 6

= 600

[Add.]

Step: 7

Therefore, about 600 students are there in the school.

Correct Answer is : 600

[Round to the nearest ten.]

Step: 1

Money with Jim = $205.

Step: 2

205 rounded to the nearest ten is 210.

Step: 3

Money he spent = $181.

Step: 4

181 rounded to the nearest ten is 180.

Step: 5

Money left with Jim = 210 - 180 = 30.

[Substitute the rounded values.]

Step: 6

So, the amount left with Jim is about $30.

Correct Answer is : $30

Step: 1

Number of chocolates that Lucas has = 192

Step: 2

Round 192 up to 200.

Step: 3

Number of chocolates he distributed = 132

Step: 4

Round 132 down to 100.

Step: 5

Number of chocolates he has now = 200 - 100 = 100

Step: 6

So, the estimated number of chocolates that Lucas has now is 100.

Correct Answer is : 100

Step: 1

Number of tickets yet to be sold = Total number of tickets - Number of tickets sold by Bill

Step: 2

= 357 - 226

[Substitute.]

Step: 3

= 360 - 230

[Round the values to the nearest ten.]

Step: 4

= 130

[Subtract.]

Step: 5

So, the number of tickets left to be sold rounded to the nearest ten is 130.

Correct Answer is : 130

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- Prime and Composite Numbers-Gr 4-Solved Examples
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- Estimate