To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the fourth significant figure. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
e A number that has only 1 significant figure can't be rounded to 3 significant figures
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.
100 is already rounded to one significant figure.
To express 273 to one significant figure, you round it to the nearest ten. The first significant figure is 2, and since the digit following it (7) is 5 or greater, you round up. Therefore, 273 to one significant figure is 300.
10000000
946000
e A number that has only 1 significant figure can't be rounded to 3 significant figures
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.
It's already there.
100 is already rounded to one significant figure.
200 Explanation: 2 is the one significant figure. The zeros are not significant. Round up because it is closer to 200 than to 100.
7000
2,000
8.87
2,000,000
9000
0.1