98.425% of 1 inch (rounded).
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The normal size of a ruler should be 12 inches or 30cm. (30 cm=300 mm) (1 in=25 mm)
25 dcm is 2,500 mm
25.4 mm = 1 in → 25 mm = 25 ÷ 25.4 in ≈ 0.98 in
25 mm = 2.5*10-5 km
250 mm = 25 centimetres.