Question

The number of significant figure
in (A+B) is (given : A=1.234,
B=5.29)

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Answer 1

A+B = (A+B) upto least decimal places

A = 1.234

B = 5.29 (least and 2 decimal places 2 & 9)

1.234 + 5.29 = 6.52

Significant figures are 6,5 & 2 so there are 3 significant figures.

:-)

Answer 2

The number of significant figure in (A+B) is 3.

Explanation:

• A = 1.234
• B = 5.29
• A+B = 6.524

Rule of significant figures in case of addition:

'Limit the answer to the least number of decimal place'

• A has 3 digits to the right of decimal.
• B has 2 digits to the right of decimal.
• So the answer must be limited up to 2 decimal places only.
• The answer 6.524 is limited to 6.52.

Thus, the number of significant figures in answer 6.52 is 3.

The answer has 3 significant figures: 6, 5, 2.

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