As stated the question is nonsense as you cannot compare unitsto numbers.-----------------------------------------------------------However, if you have forgotten to include the units of the 25.4,then It depends upon the units of the 25.4:If the units are dm (decimetres), then they are the same since 1dm = 10 cm→ 25.4 dm = 25.4 × 10 cm = 254 cmIf the units are less than dm, eg mm, µm, nm, pm, in,barleycorns, thou, then 254 cm are greater.If the units are greater than dm, eg m, dam, hm, km, Mm, hands,feet, yards, fathoms, rods, chains, furlongs, miles, nauticalmiles, leagues, light years then 254 cm are less.