Round off upto correct number of significant figures
and please explain 2.1252
Answers
Answer:
We will about……..
● Rules to find the number of significant figures
● Rounding off a decimal to the required number of significant figures
● Round off to a special unit.
Step-by-step explanation:
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Significant Figures
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In rounding off significant figures or significant digits we will be very useful because it enables us to simplify complex calculation.
We will about……..
● Rules to find the number of significant figures
● Rounding off a decimal to the required number of significant figures
● Round off to a special unit.
What are Significant figures?
If we have to find the speed of car with the help of speedometer, we observe that the speed lies between 92.4 km/hr and 92.5 km/hr. By close observation, we can say approximately that the speed of car is 92.46 km/hr. The last digit 6 is however uncertain.
Thus, significant figures are all certain digits in a measurement plus one uncertain digit. The use of significant figures in measurement and value is a form of rounding.
Thus, in the above example, we say that 92.46 km/hr has four significant figures.
Rules for finding the number of significant figures:
1. All non–zero numbers (1, 2, 3, 4, 5) are always significant.
For example;
● 1325 has four significant figures
● 235.14 has four significant figures
2. All zeros between non-zero numbers are always significant.
For example;
● 204.003 has six significant figures.
● 50.00 has four significant figures.
● 51.02010 has seven significant figures.
3. In a decimal number which lies between 0 and 1, all zeros which are to the right of the decimal point but to the left of non-zero number are not significant.
For example;
● 0.00247 has only three significant figures.
● 0.002030 has four significant figures.
Step-by-step explanation:
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