I would suppose the word "initially" might work.
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345 ÷ 5 = 69→ previous multiple is 5 x (69-1) = 5 x 68 = 340.
699 comes before and 701 comes after
5 comes before 6.
A nanosecond comes before an attosecond and before a nano second is a millisecond and before that is a second
999 + 1 = 1000 Therefore, 999 comes before 1000.