Rounding Word Problems

**Page 1**

1.

Estimate the total cost of 3 albums marked $7.40, $8.65, and $11.95. Round to the nearest dollar.

a. | $25 | ||

b. | $18 | ||

c. | $28 | ||

d. | $20 |

$8.65 rounded to the nearest dollar is $9.

$11.95 rounded to the nearest dollar is $12.

The total cost of the 3 albums

[Add the values.]

The cost of 3 albums is about $28.

Correct answer : (3)

2.

Roddick earned $12.35 for mowing a lawn and $24.75 for working at a restaurant in a single day. Estimate the amount he earned on that single day. Round to the nearest dollar.

a. | $32 | ||

b. | $30 | ||

c. | $45 | ||

d. | $37 |

$12.35 rounded to the nearest dollar is $12.

Amount Roddick earned working at a restaurant is $24.75.

$24.75 rounded to the nearest dollar is $25.

The amount Roddick earned in a single day

Amount Roddick earned in a single day is about $37.

Correct answer : (4)

3.

Amanda bought 10 books for $28.45, 5 pens for $15.15, and 5 pencils for $6.75. Estimate the total amount that Amanda spent.

a. | $60 | ||

b. | $50 | ||

c. | $30 | ||

d. | $45 |

$28.45 rounded to the nearest dollar is $28.

Cost of 5 pens is $15.15.

$15.15 rounded to the nearest dollar is $15.

Cost of 5 pencils is $6.75.

$6.75 rounded to the nearest dollar is $7.

Cost of all the items

[Add the values.]

The total amount spent by Amanda in buying all the items is about $50.

Correct answer : (2)

4.

Roseberg works 20 hours per week at a gas station where he earns $8.75 per hour. He also works 15 hours per week as a pizza delivery boy and earns $5.75 per hour. Estimate the amount Roseberg earns in a week.

a. | $240 | ||

b. | $270 | ||

c. | $370 | ||

d. | $300 |

Amount earned by Roseberg working 20 hours in a gas station

$5.75 rounded to the nearest dollar is $6.

Amount earned by Roseberg working 15 hours as a pizza delivery boy

Total amount earned by Roseberg per week is about $180 + $90 = $270

Estimated amount Roseberg earned in a week is $270.

Correct answer : (2)

5.

The cost of a book is $6.25 and the cost of a bag is $35.80. Find the cost of 15 books and 3 bags. Round to the nearest dollar.

a. | $180 | ||

b. | $189 | ||

c. | $190 | ||

d. | $198 |

$6.25 rounded to the nearest dollar is $6.

Cost of 15 books

The cost of a bag is $35.80.

$35.80 rounded to the nearest dollar is $36.

Cost of 3 bags

Cost of 15 books and 3 bags

So, the cost of 15 books and 3 bags is about $198.

Correct answer : (4)

6.

Justin made three telephone calls, which cost him $6.78, $3.82, and $7.18. Estimate the total money spent.

a. | $11 | ||

b. | $18 | ||

c. | $16 | ||

d. | $13 |

[Round to the nearest dollar.]

$3.82

[Round to the nearest dollar.]

$7.18

[Round to the nearest dollar.]

$7 + $4 + $7 = $18

[Add the rounded values.]

Justin spent about $18 for telephone calls.

Correct answer : (2)

7.

Kathy needs to pay $59.65 for a book. If she has only ten dollar bills, then estimate how much money she should give to the clerk.

a. | round up to $59.70 | ||

b. | round down to $59.50 | ||

c. | round up to $60.00 | ||

d. | round down to $50.00 |

Correct answer : (3)

8.

Which of the following represents 2.388 rounded to the nearest tenth?

a. | 3 | ||

b. | 2.4 | ||

c. | 2.3 | ||

d. | 2.310 |

[Original Decimal.]

As 3 is in the tenths place, 2.388 rounds to 2.3 or 2.4

8 is the digit to the right of 3.

Since 8 > 5, 2.388 rounds to 2.4 than 2.3

To the nearest tenth, 2.388 rounds to 2.4

Correct answer : (2)

9.

Find the decimal that represents 0.7167 rounded to the nearest hundredth and then to the nearest tenth.

a. | 0.8 | ||

b. | 0.9 | ||

c. | 0.7 | ||

d. | 0.6 |

[Original Decimal.]

The digit in hundredths place is 1.

The digit to the right of 1 is 6, which is greater than 5.

Since the decimal in thousandths place is greater than 5, to the nearest hundredths 0.7167 rounds to 0.72

Since 7 is in the tenths place, 0.72 rounds to 0.7 or 0.8

2 is the digit to the right of 7.

Since 2 < 5, 0.72 is closer to 0.7 than 0.8

Correct answer : (3)

10.

Which of the following represents 298.3669 rounded to the nearest hundredth and then to the nearest tenth?

a. | 298.4 | ||

b. | 298.37 | ||

c. | 298.3 | ||

d. | 298.5 |

[Original Decimal.]

The digit in the hundredths place is 6.

The digit to the right of 6 is 6 and 6 > 5.

298.37

The decimal rounded to nearest hundredths'

3 is in the tenths place so 298.36 rounds to 298.3 or 298.4

6 is the digit to the right of 3.

Since 6 > 5, 298.36 is closer to 298.4 than 298.3

Correct answer : (1)