Question

Find the L.C.M. of 140 and 168. Use the L.C.M. obtained to find the H.C.F. of the given numbers.

Answer 1

Numbers are 140 and 168
L.C.M. of 140 and 168

2	140,	168
2	70,	84
7	35,	42
	5,	6

= 2 × 2 × 7 × 5 × 6 = 840

H.C.F. =`"1st number×2nd number"/"L.C.M."`

= `(140×168)/840`

= 28