57.50
0.6000
145 * 10^4
To round the number 1127436092 to four significant figures, identify the first four significant digits, which are 1127. The next digit is 4, which is less than 5, so you do not round up. Therefore, the number rounded to four significant figures is 1127000000.
To round 1,248,486 to four significant figures, you focus on the first four digits, which are 1, 2, 4, and 8. The digit following these is 4, which means you do not need to round up. Therefore, 1,248,486 rounded to four significant figures is 1,248,000.
0.019807 rounds to 0.01981
2.540x10^4
Starting at the second digit after the decimal, if it is between 0 and 4, you round the first digit down. If it is between 5 and 9, you round it up. If the third digit is between 0 and 4, you round the second digit down. If it is between 5 and 9, you round the second digit up. Rounded to.......... 1 signifcant figure: .3 2 significant figures: .29 3 significant figures: .294 4 significant figures: .2943 5 significant figures: .29430
To round 644 to two significant figures, you look at the first two digits, which are 6 and 4. The next digit is 4, which is less than 5, so you do not round up. Therefore, 644 rounded to two significant figures is 640.
1.000 x 10^5
Just cut off the numbers at the eight: 48,000,000
4 significant figures.
You have to round to two significant digits because 5.5 only has two. So, 5.5 × 2.141 = 12