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You must multiply 14 by 15 and then add 100 (1m=100cm).
14 x 15 is the same as (7 x 2) x (5 x 3) or 7 x 2 x 5 x 3 and that is the same as 2 x 5 x 7 x 3 or (2 x 5) x (7 x 3)