2.5 cm looks like about 1 inch on a ruler
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1.77 inches
25cm = quarter metre.
25cm is longer than 200mm which equals 20cm
You'll find out by looking at the distance between 0 and 4 on a ruler. Simple and easy!
1% of 25cm = 1% * 25 = 0.01 * 25 = 0.25cm