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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)