copyright © 2011 pearson education, inc. publishing as prentice hall. 1.4 rounding and estimating

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1.4

Rounding and Estimating

Martin-Gay, Prealgebra & Introductory Algebra, 3ed 22

23 rounded to the nearest ten is 20.

48 rounded to the nearest ten is 50.

15 rounded to the nearest ten is 20.

10 2015

40 5048

20 3023

Rounding

Martin-Gay, Prealgebra & Introductory Algebra, 3ed 33

Rounding Whole Numbers

Step 1: Locate the digit to the right of the given place value.

Step 2: If this digit is 5 or greater, add 1 to the digit in the given place value and

replace each digit to its right by 0.

Step 3: If this digit is less than 5, replace it and each digit to its right by 0.

Page 4: Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 1.4 Rounding and Estimating

Martin-Gay, Prealgebra & Introductory Algebra, 3ed 44

Making estimates is often the quickest way Making estimates is often the quickest way to solve real-life problems when their to solve real-life problems when their solutions do not need to be exact.solutions do not need to be exact.

Estimates

Page 5: Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 1.4 Rounding and Estimating

Martin-Gay, Prealgebra & Introductory Algebra, 3ed 55

Estimation is useful to check for incorrect Estimation is useful to check for incorrect answers when using a calculator. For example, answers when using a calculator. For example, pressing a key too hard may result in a double pressing a key too hard may result in a double digit, while pressing a key too softly may digit, while pressing a key too softly may result in the number not appearing in the result in the number not appearing in the display.display.

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