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What are the rules for rounding numbers?

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 10Q Chapter 2

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 10Q

Problem 10Q

What are the rules for rounding numbers?

Step-by-Step Solution:

Solution 10Q

Step 1:

The rules are as given below

Rule 1

In rounding off numbers, the last figure kept should be unchanged if the first figure dropped is less than 5

For example, if only one decimal is to be kept, then 6.422 becomes 6.4.

Rule 2

In rounding off numbers, the last figure kept should be increased by 1 if the first figure dropped is greater than 5

For example, if only two decimals are to be kept, then 6.4872 becomes 6.49.

Rule 3

In rounding off numbers, if the first figure dropped is 5, then the last figure kept should be unchanged if that last figure is even.

For example, if only one decimal is to be kept, then 6.65 becomes 6.6.

Rule 4

In rounding off numbers, if the first figure dropped is 5,and the  last figure kept is odd,then the last figure kept should be increased by 1.  For example, 6.755 becomes 6.76.

Step 2 of 1

Chapter 2, Problem 10Q is Solved
Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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What are the rules for rounding numbers?