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SIGNIFICANT FIGURES (GRADE 11)

 
 
“The meaningful digits which are known with certainty in a measurement are called significant figures.”
Significant figures of a measurement are decided by following rules-
 
(1) All non-zero digits are considered to be significant figures.
For example, if the length of a pencil is measured to be 5.32 cm.  Then, there
are in all 3 significant figures in the measurement.
 
(2) All zeroes between two non-zero digits are considered to be significant figures.
For example, in 2.06, there are in all 3 significant figures.
 
(3) All zeroes after a non-zero digit are considered to be significant figures.
For example, in 2.00, there are in all 3 significant figures.
 
(4) All zeroes coming before a non-zero digit are not considered to be
significant figures. For example, in 0.0023, there are only 2 significant figures.
 
(5) If a number is represented as scientific notation i.e. in the power of 10 then the significant figure is decided by the co-efficient of the number.
For example, in Avogadro’s number, 6.022 ×1023 there are in all 4 Significant
Figures.

(6) Exact numbers have an infinite number of significant figures.
For example, in 2 balls or 20 eggs, there are infinite number of significant
figures as these are exact numbers and can be represented by writing infinite
numbers of zeros after placing a decimal i.e. 2.00000---- or 20.000000-----.
 
“You cannot teach a man anything, you can only help him find it within himself.”
-Galileo

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