842 to the nearest 1000 is 1000. When rounding to the nearest 1000, we look at the hundreds place of the number in question. Since the hundreds place in 842 is less than 500, we round down to the nearest 1000, which is 1000.
145
840
84.2% = 0.842 = 842/1000 or 421/500 in fraction
It ends with a 2, so it must be rounded down to 840.
1000
1000
1000
1000
840
1000
1000
It is: 500 to the nearest 100 but zero to the nearest 1000