Estimation

To estimate, 98 / 17, what would be a quick way to do it?

• 90 / 10

• 100 / 20

• 90 / 20

To estimate, 81 / 19, an easy way to get a quick estimate is to divide...

• 90 / 10

• 80 / 10

• 80 / 20

To estimate, 369 / 61, an easy way to get a quick estimate is to divide...

• 370 / 60

• 360 / 60

• 360 / 70

To estimate, 397 / 48, an easy way to get a quick estimate is to divide...

• 390 / 50

• 400 / 40

• 400 / 50

Brian says that he read a book that contains 54,000 words  He says that he rounded the actual number of words to the nearest thousand.  Which could be the number of words in Brian's book?

• 53,481

• 54,900

• 54,199

• 55,310

If you have 382, you might say you have ABOUT...

• 400

• 390

• 450

• 350

The number 1000 has been rounded to the nearest 100. Find its lower and upper bounds

• 950  ≤ 1000  < 1050

• 950 ≤ 1000 < 1050.1

• 950 ≤ 1000 < 1051

Roughly, approximately, and about are all clues for knowing when to round or estimate.

• True

• False

237 fifth graders and 346 fourth graders went on a field trip. Estimate how many more fourth graders were on a field trip than fifth graders.

• 200 more

• 109 more

• 100 more

• 110 more

In 1983, Smith's Popcorn employed 436 people. Twenty years later, in 2003, the company employed 594 people. What is an estimate for the difference between the number of employees in 1983 and 2003?

• A. about 1,200 employees

• B. about 400 employees

• C. about 200 employees

• D. about 1,030 employees