20
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The LCM is 40.
§4
To find the LCM Factorise. 4 = 2 x 2 10 - 2 x 5 '2' is a common factor , so we are left with another '2' & a '5' Hence # 2 x 2 x 5 = 4 x 5 = 20 the LCM
4= 1, 2, 4 10= 1, 2, 5 LCM = 2 x 1x1x4x5= 40
40