The usual practice is that .5 or higher (.6, .7 etc.) is rounded up to the next highest integer, so that for example 8.5 can be rounded up to 9. You can do the same thing at any position in the number, for example, you can round up the number 432,669.00735 to 432,669.0074 if you so desire.
0.000039 as you have to round it up. 3 and 8 are the significant figures but as you must round up, the answer becomes 0.000039.
When multiplying numbers with significant figures, round the final answer to match the number with the least significant figures in the original numbers.
Starting at the second digit after the decimal, if it is between 0 and 4, you round the first digit down. If it is between 5 and 9, you round it up. If the third digit is between 0 and 4, you round the second digit down. If it is between 5 and 9, you round the second digit up. Rounded to.......... 1 signifcant figure: .3 2 significant figures: .29 3 significant figures: .294 4 significant figures: .2943 5 significant figures: .29430
To round a number to 2 significant figures, you first need to look at the first two digits. In this case that is 3.5. The next step is to look at the third digit and assess if we need to round up. If the digit is 5, 6, 7, 8 or 9 you round up. Otherwise you leave the figures as they are (round down). In this case the third digit is 8, and so we do need to round up. Thus 3.582 rounded to 2 significant figures is 3.6
17.9867 to 3 significant figures is 18.0
2808 into 3 significant figures is 2810
1100 to 3 significant figures is 1.10e3
To round 233.356 to 2 significant figures, you first identify the first two non-zero digits from the left, which are 2 and 3. The digit after the second significant figure is 3. Since 3 is greater than 5, you round up the last significant figure. Therefore, rounding 233.356 to 2 significant figures gives you 230.
If you are rounding off to two significant figures the result is 33.Sixes always round up to the next higher digit i.e.296 to two significant figures is 30 *101
88930371.007 to 2 significant figures is 89000000
0.0000004799 into 3 significant figures is 4.80e-7
0.0034088 in three significant figures would be 0.00341