First, compare the number of digits. Since they are the same, compare the first (leftmost) digit. Then compare the second digit, etc., continuing until you find a digit that is greater in one number than in the other.
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Well, what I do is i add 678 plus 300 in my head (this would equal 978) then add 3 (this would equal 981)
5000-678 = 4322
The factors of 678 are 1, 2, 3, 6, 113, 226, 339, and 678.
234 + 678 = 912
789 + 678 = 1467