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
1284 rounded to the nearest thousand is 1000. When rounding to the nearest thousand, we look at the hundreds place, which in this case is 2. Since 2 is less than 5, we round down to the nearest thousand, which is 1000.
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.
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.
100
That is 4800
4198 to the nearest 100 = 4200
100
100
100
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.