Question

State rule for addition and subtraction of significant figures

Answer 1

Heya user......

a) First perform all the operations.
b) Round off your result so that you include only 1 uncertain digit.
The last digit of any measurement is considered uncertain.
When an uncertain digit is added to (or subtracted from)
a certain digit, the result is an uncertain digit.
(UNCERTAIN DIGITS ARE HIGHLIGHTED)
Example: 153. ml + 1.8 ml + 9.16 ml = 163.96 ml
Answer = 164 ml (3 sig figs; only 1 uncertain digit)
Notice that the answer is rounded to the same precision as the least precise measurement, which was 153. ml

HOPE IT HELPS ✌✌✌

Answer 2

In these two Operations the final result should have the same number of decimal places as the number with minimum number of decimal places.