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Estimate each sum or difference.

1. 2.

3. At the SPCA there are 186 dogs, 53 cats, and 67 other animals. Estimate the total amount of animals at the SPCA.

4. The tallest building in the world is Burj Khalifa, a skyscraper in Dubai that is 2,723 feet tall. The tallest building in Houston is the 75-story JPMorgan Chase tower which rises 1,002 feet. About how much taller is the world’s tallest building than Houston’s tallest building?

98

473

798

8,342

Estimating Products and Quotients of Whole Numbers

Estimating Products

To estimate the product of two numbers, you need to round each number to its largest place value.

Example:

78

246

80

200

Estimate the Product

43

271

40

300

Estimate the Product

7

64

7

60

Estimate the Product

577

2714,

600

000,4

Estimate the Product

8

751

8

800

Terry can read about 47 pages of a novel in one hour. Which is the best estimate for the number of pages Terry could read in 6 hours?

a. 200 b. 300

c. 400 d. 500

A neighborhood gas station is opened 24 hours a day. Approximately 62 cars come to the gas station each hour. Which is the best estimate for the number of cars that visit the gas station in one day?

a. 1,200 b. 1,650

c. 1,800 d. 1,000

Each month the Fort Bend County Libraries loans about 2,945 books. Which is the best estimate for the number of books loaned in 1 year?

a. 10,000 b. 30,000

c. 60,000 d. 70,000

Estimating Quotients

To estimate the quotient of two numbers, you need to use compatible numbers.

Example: 194 204

Estimate the Quotient

335 355

Estimate the Quotient

4289 4509

Estimate the Quotient

37512 36012

Estimate the Quotient

3125 3005

Estimate the Quotient

5516 5406

Estimate the Quotient

57837 56007