Question

The final result of the sum of the numbers 523.32, 1.21524 and 107.3 rounded to correct significant figures is

• A. 631.8
• B. 631.835
• C. 631.83
• D. 631.8352
• E. 631.83524

Answer 1

The Correct Option is A

When adding numbers, the result should be rounded to the least number of decimal places in the operands. The numbers provided are:
523.32 (2 decimal places),
1.21524 (5 decimal places),
107.3 (1 decimal place).
The sum of these numbers is: \[ 523.32 + 1.21524 + 107.3 = 631.83524 \]
Since the number with the least decimal places is 107.3 (1 decimal place), the result must be rounded to 1 decimal place.

The correct option is (A) : \(631.8\)

Answer 2

First, add the numbers: 
$523.32 + 1.21524 + 107.3 = 631.83524$  

Now round the result based on the number with the least number of decimal places (which is 107.3 — only 1 decimal place). 

Therefore, the result should be rounded to **1 decimal place**: 
$631.83524 \approx \mathbf{631.8}$ 

Correct answer: 631.8