0.010229 rounded to four significant figures would be 1.023×10⁻².
What are significant figures?
In positional notation, significant figures refer to the digits in a number that is trustworthy and required to denote the amount of something, also known as the significant digits, precision, or resolution.
Only the digits allowed by the measurement resolution are reliable, so only these can be significant figures if a number expressing the result of a measurement (such as length, pressure, volume, or mass) has more digits than the number of digits allowed by the measurement resolution.
By leaving one or more digits from the right, a number is rounded off to the necessary number of significant digits. The last digit held should not change if the first digit in the left column is less than 5. The last digit is rounded up when the first digit exceeds 5. When there are exactly five digits remaining, the number held is rounded up or down to an even number. Rounding off should be done as a whole rather than one digit at a time when there are multiple digits left.
Thus,0.010229 be rounded into four significant figures would be 1.023×10⁻²
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