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Adding numbers using only the significant digits can introduce inaccuracies, for example if you are adding pi ten times using 4 decimal places of pi the answer is 31.416 but the right answer is 31.4159 . .

Subtracting can give quite bad errors especially when two nearly equal numbers are subtracted. So for subtraction it's best to use more significant figures and round the answer to the required number of digits afterwards.

Q: How do you add number using significant digits?

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The significant digits are: 3701; so there are four such digits in the measurement. These are the digits that convey the degree of precision included. Leading zeroes and trailing zeroes do not add such meaning.

Add the digits together. The sum of the digits of 23 is 5.

No, it is not true. They reflect the precision of the number in the context of its use. If required to calculate the population density of Greater London in 2011, I would use the population in millions - not because that is the limit of the accuracy of the census results but because greater accuracy does not add significant value to the precision of the population density.

7

They add up to 9

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3.5g

5.2g When you add or subtract using significant figures, you round the answer to the fewest number of decimal places as the measurement with the fewest decimal places.

Add the least significant digits (carry any thing greater than the base)Add the carry and the next least most significant digits, (carry anything greater than the base)Add the third most significant digits, (carry anything greater than the base)Add the carry to the most significant digit.Done

124.68 significant figures means figures after the decimal, in the case after the 8, if the number after the significant figure is 4 or lower the last SF (significant figure) stays the same, if 5 or higher then you add one. for example the number 124.683 to one SF is 124.7, because 8 means you round the last number up (add one) * * * * * The above answer could no be more incorrect! It has confused decimal digits with significant digits. 124.683, to 2 sig digits is 120. The two non-zero numbers 1 and 2 and everything else 0.

The significant digits are: 3701; so there are four such digits in the measurement. These are the digits that convey the degree of precision included. Leading zeroes and trailing zeroes do not add such meaning.

if you add the digits of the number such as 81 8+1=9 every time, the digits of the number will add up to 9

Some persons consider as significant digits only 3 and 9; I think that is more correct to consider as significant digits 3,9,0,0,0. Other propose to add bars or points (as 39000.) for distinction but this system is not practically used.

Add the digits together. The sum of the digits of 23 is 5.

It is 13.2 grams.

No, it is not true. They reflect the precision of the number in the context of its use. If required to calculate the population density of Greater London in 2011, I would use the population in millions - not because that is the limit of the accuracy of the census results but because greater accuracy does not add significant value to the precision of the population density.

The number of digits increases - without limit.

2014 ( The sum of the digits = 7, a prime number )