99.9 rounded to 2 significant figures is 1.0e2
6,256 rounded to 1 significant figure is 6,000
When rounding 1286 to 2 significant figures, you must consider the first two non-zero digits from the left. In this case, those digits are 1 and 2. The digit to the right of 2 (8) is greater than 5, so you round up. Therefore, 1286 rounded to 2 significant figures is 1300.
When rounding 7463 to 2 significant figures, we look at the digit in the hundred's place, which is 4. Since the digit immediately to the right of the hundred's place is 6, which is 5 or greater, we round up the hundred's place digit by 1. Therefore, 7463 rounded to 2 significant figures is 7500.
To round 1467 to three significant figures, we start counting from the left until we have three digits: 1, 4, and 6. The digit after the third significant figure is 7, which is greater than or equal to 5, so we round up the last significant figure. Therefore, 1467 rounded to three significant figures is 1470.
Sometimes they are. 101.1203 has seven significant figures: 1, 0, 1, 1, 2, 0 and 3. 12.2300 has six significant figures: 1, 2, 2, 3, 0 and 0. 120.00 has five significant figures.
99.9 rounded to 2 significant figures is 1.0e2
At least 1 and at most 7. It could be 3,999,999.9 rounded to 7 significant figures; It could be 3,999,999 rounded to 6 significant figures; It could be 4,000,015 rounded to 5 significant figures; It could be 4,000,429 rounded to 4 significant figures; It could be 3,999,999 rounded to 3 significant figures; It could be 4,049,999 rounded to 2 significant figures; It could be 4,492,467 rounded to 1 significant figure.
7000
A number with only 1 significant figure can't be rounded to 3 significant figures
4000 has between 1 and 4 significant figures: if it is a rounded number, then it could have been 3999.9, for example, which would be rounded to 4000 to 1, 2, 3 or 4 significant figures.
5.000e-1 = 1.8394 When rounded to two significant figures, the answer would be 1.8
6,256 rounded to 1 significant figure is 6,000
It already is rounded to three significant figures.
76.51 rounded to 1 significant figures would be 77
e A number that has only 1 significant figure can't be rounded to 3 significant figures
0.53