1284 is an integer, not a fraction and there is no sensible way to express it as a fraction. However, if you must, it can be expressed as 1284/1.
100
187 to the nearest 100 = 200
100
The nearest 100 to 217 is 200.
1300
1300
It is: 1000
122 to the nearest 100 is 100
1284 rounds to 1300. 976 rounds to 1000. 489 rounds to 500. 1042 rounds to 1000. The rounded figures add to 3800. The actual figures add to 3791, so it is quite close.
1284 is an integer, not a fraction and there is no sensible way to express it as a fraction. However, if you must, it can be expressed as 1284/1.
103 to the nearest hundreds is 100
100
100
4198 to the nearest 100 = 4200
That is 4800
100