Question

The number of significant figures in the sum of 13.21, 8.0
and 2.222 are
(a) 5
(b) 4
(c) 3
(d) 2 with explanation​

Answer 1

There are three significant figures in the answer.

Given:

Three numbers are 13.21, 8.0, and 2.222

Find:

The number of significant figures in their sum.

Solution:

• First of all, we will count the number of significant decimals in each number.
• 13.21 we have 2 significant decimals.
• 8.0 we have one significant decimal.
• 2.222 we have 3 significant decimal.
• Check which number has the least significant decimals.
• 8.0 has only one significant decimal.
• In the sum, the digit should have only one significant decimal number.
• we will find the sum of the numbers
• 13.21 + 8.0 + 2.222 =  23.432
• We will round it off to the first decimal
• As the number to the right of 4 is 3 (less than 5), we will round it off to 23.4
• So the final answer is 23.4, as all non-zero digits are significant, it has 3 significant digits.
• #SPJ1