25cm is longer than 200mm which equals 20cm
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Well, darling, a strip measuring 25cm longer than a strip measuring 220mm is actually the same length. You see, 25cm is equal to 250mm, so both strips are 250mm in length. Math may not be everyone's cup of tea, but it's as simple as that!
200mm = 20cm
25cm = quarter metre.
1% of 25cm = 1% * 25 = 0.01 * 25 = 0.25cm
1m = 100cm 25cm x (1m/100cm) = 0.25m