13, as in 1300 hours? That's 1 pm on the 24 hour clock (easy conversion, if the time is larger than 1200, subtract 1200 to get the time equivalent on the 12 hour clock)
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13/10 or 13 / 10
-13/1...i think o.O
25.4 mm = 1 in → 13 mm = 13 ÷ 25.4 in ≈ 0.51 in
Expressed as a decimal fraction, 13 percent is equal to 13/100 = 0.13.
13 is a whole number. One way to write it as a fraction is 13/1.