10.2449 to 1 significant figure
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Answers
Calculator Use
Round a number to a quantity of significant figures that you provide.
Enter whole numbers, real numbers, scientific notation or e notation. Example inputs are, 3500, 35.0056, 3.5 x 10^3 and 3.5e3.
Rounding Significant Figures Rules
Non-zero digits are always significant
Zeros between non-zero digits are always significant
Leading zeros are never significant
Trailing zeros are only significant if the number contains a decimal point
Examples of Significant Figures
How Many
Significant Figures? Which Figures
are Significant?
81 2 8, 1
26.2 3 2, 6, 2
0.007 1 7
5200.38 6 5, 2, 0, 0, 3, 8
380.0 4 3, 8, 0, 0
78800 3 7, 8, 8
78800 4 7, 8, 8, 0
78800. 5 7, 8, 8, 0, 0
In rounding significant figures, when an integer contains more digits than are significant, the last significant digit has an overline to indicate that it is the last significant digit.
Rounding Rules
When rounding significant figures the standard rules of rounding numbers apply, except that non-significant digits to the left of the decimal are replaced with zeros.
Example: 356 rounded to 2 significant digits is 360
This calculator rounds down if the next digit is less than 5 and rounds up when the next digit is greater than or equal to 5.
In the table below 305.459 is rounded from 0 to 6 significant figures. For comparison the same number is rounded from 0 to 6 decimal places. You can see the difference between rounding for significant figures and rounding to decimal places.
Rounding the Number 305.459
Rounded to How Many
sf or dp? Rounded to
Significant Figures (sf) Rounded to
Decimal Places (dp)
0 -- 305
1 300 305.5
2 310 305.46
3 305. 305.459
4 305.5 305.4590
5 305.46 305.45900
6 305.459 305.459000
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