Q3 of 128 Page 18

Find g. c. d. and l.c.m.. :

40, 60, 80

40 = 2 × 20 = 2 × 2 × 10

= 2 × 2 × 2 × 5


60 = 2 × 30 = 2 × 2 × 15 = 2 × 2 × 5 × 3


80 = 2 × 40 = 2 × 2 × 20 = 2 × 2 × 2 × 10


= 2 × 2 × 2 × 2 × 5


Therefore, g. c. d(40, 60, 80) = 2 × 2 × 5 = 20


l.c.m.(40, 60, 80) = 24 × 3 × 5 = 16 × 15 = 240


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