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As a mixed number, it is 42 65/1000= 4213/200
The rules of significant figures are as follows;1) Significant figures are the first digit in the number that isn't a '0'. Doesn't matter how far behind or in front of the decimal point it is.1st Significant figure of 5098 is 5000. The first number that isn't a '0'.When you get onto the 2nd is when it gets confusing. After the first significant figure, any number which comes after it is a significant figure regardless of whether it is a Zero.Thus the second significant figure of 5098, is 5000 too.And the third? Well, it's the third number in.So the third is 5090.In addition, you add significant figures like any other number. Due to the fact that it is rounded off, however, it will not be exact.
There are three significant figures in the number 8.09. The first two digits, 8 and 0, are considered significant because they are non-zero numbers. The third digit, 9, is also significant because it follows a non-zero number and is a measured value.
To find a number to two significant figures or any amount of significant figures you look at one plus the amount of asked figures, in this case the third significant figure, and if it is 5 or greater increase the asked amount of significant figures by one. If it is 4 or less make no changes to your number. Finally report the calculated number with the asked amount of significant figures.
The value of Pi (3.1415927) to three significant figures is 3.142. If you look at the number, you're concentrating on the third & fourth digits after the decimal point. since the fourth digit is 5 or more, you round UP the third digit.