Question

3. What is the number of significant figure in
(3.20 + 4.80) x 10^5 ?
(a) 5
(6) 4
(C) 3
(d) 2​

Answer 1

The number of significant figure in (3.20 + 4.80) × 10⁵ is 3

Given :

The number (3.20 + 4.80) × 10⁵

To find :

The number of significant figure in (3.20 + 4.80) × 10⁵ is

(a) 5

(b) 4

(c) 3

(d) 2

Concept :

The figures that are used in representing a number are called significant figures

In order to count the number of significant figure we follow the below rules

1. The leading zero are used to fix the position of the decimal point. Leading zeroes are not significant

2. In a given number all non zero digits are significant

3. All zeroes which occurs between two non zero digits are significant

4. The digits occurs in the exponents of 10 are not significant

Solution :

Step 1 of 2 :

Write down the given number

Here the given number is (3.20 + 4.80) × 10⁵

Step 2 of 2 :

Calculate the number of significant figure

(3.20 + 4.80) × 10⁵

= 8.00 × 10⁵

Thus the significant figures are 8 , 0 , 0

So the number of significant figure in (3.20 + 4.80) × 10⁵ is 3

Hence the correct option is (c) 3

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