
Concept explainers
(a)
Interpretation: The given number
Concept Introduction: Rules used for rounding off numbers are as follows:
If the digit to be removed:
- Is less than 5, then digit before it remains the same.
- Is greater than 5, then digit before it is increased by 1 unit.
- Is equal to five, then if the digit before it is odd then it is increased by 1 unit and if the digit is even then it remains the same.
(a)

Answer to Problem 26A
Explanation of Solution
At first, the number is written as follows:
The number is rounded off to two significant figures, so, look at the digit which is to be removed. The digit to be removed is 6 that is greater than 5. Hence, the digit before it is increased by 1. Therefore,
(b)
Interpretation: The given number
Concept Introduction: Rules used for rounding off numbers are as follows:
If the digit to be removed:
- Is less than 5, then digit before it remains the same.
- Is greater than 5, then digit before it is increased by 1 unit.
- Is equal to five, then if the digit before it is odd then it is increased by 1 unit and if the digit is even then it remains the same.
(b)

Answer to Problem 26A
Explanation of Solution
To round off the given number to two significant figures, first look for the digit which is to be removed. In this case, the digit to be removed is larger than 5. Thus, the number becomes
(c)
Interpretation: The given number
Concept Introduction: Rules used for rounding off numbers are as follows:
If the digit to be removed:
- Is less than 5, then digit before it remains the same.
- Is greater than 5, then digit before it is increased by 1 unit.
- Is equal to five, then if the digit before it is odd then it is increased by 1 unit and if the digit is even then it remains the same.
(c)

Answer to Problem 26A
Explanation of Solution
The number
Firstly, look for the digit which is to be removed. The digit to be removed is smaller than 5. Hence, no change takes place in the digit before it. Therefore,
(d)
Interpretation: The given number
Concept Introduction: Rules used for rounding off numbers are as follows:
If the digit to be removed:
- Is less than 5, then digit before it remains the same.
- Is greater than 5, then digit before it is increased by 1 unit.
- Is equal to five, then if the digit before it is odd then it is increased by 1 unit and if the digit is even then it remains the same.
(d)

Answer to Problem 26A
Explanation of Solution
First, look at the digit which is to be removed. In this case, the digit to be removed is smaller than 5. Hence, no change in the digit before it takes place. Therefore,
Chapter 5 Solutions
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