145.992 using only four significant figures is 146.0
61.37795276 in four significant figures is 61.38
21,600 using only four significant figures is still 21,600.
840 using four significant figures is 840.0
There are 3 significant figures
It might have been possible to answer the question if the "following" multiplication had followed. But since you did not bother to make sure that it did, I cannot provide a more useful answer.
86.346 +54.43 9.5 _______ 150.276 Now after we round the number and write it in significant figures , so it should look like this; 150 why? because when we need to round a number using the significant figures , we must look for the smallest significant figures which is 9.5 .
Because otherwise you are using figures which imply an accuracy that cannot be justified.
The number 3400 has two significant figures. The rules for significant figures can be found by using the link to our friends at Wikipedia.
It isn't clear what the question is. If you are supposed to multiply or divide, and if by "signification figures" you mean significant digits, do the multiplication (or division), then round to three significant digits - since the least-precise of the numbers only has three significant digits.
Significant figures are calculated using various rules.ÊAll non-zero numbers are significant and all zeros that are to the right of the decimal point as well as at the end of a number are significant.ÊTherefore, 1.050L has 4 significant figures.
3500