287 rounded to the first digit (ones) is 287.
74,312 is already rounded to the first digit (ones).
300
5.5296
23.1
0
290
27.60 rounded to one decimal place is 27.6. The first digit to the right of the . is the tenth.
The 42nd digit of pi is 6. (The first 43 digits of pi are 3.141592653589793238462643383279502884197169. If pi were rounded to the nearest 42 digits, then the 6 would be rounded up to a seven.)
82.58% (rounded to nearest hundredth).
300
300
3.0