The difference of 13 and 5 times a number is 3.
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If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).