Write five numbers that round up to 600
write five numbers that round down to 600

Assuming we are rounding to the nearest 100, five numbers that could be rounded up to 600 are:
550, 567, 579, 580, 599
And five numbers that could be rounded down to 600 are:
601, 610, 625, 630, 649

I'm just guessing, but my answer would c. 0 to 300.