6 = 100s or 6x102
3 = 10s or 3x101
8 = 1s or 8x100
The correct way to write 638 is six hundred thirty-eight.
600
600
600
six hundred thirty eight million 638 000 000
The answer depends on the degree to which you are estimating. To the nearest thousand it is 1 thousand; to the nearest hundred, it is 600 and so on.
638 rounded to the nearest twenty-five 650.
79.75
What does 638 mean
638
638 + 577 = 1215
253 + 638 = 891