Dear Learners,

Revision of HCF and LCM

(i) The product of two numbers is 120. If their H.C.F. is 6 what is their L.C.M.

(ii) Find the least length of a rope which can be cut into whole number of pieces of lengths 45 cm, 75 cm and 81 cm.

(iii) Find the greatest number of 4-digits which is exactly divisible by 40, 48 and 60.

(iv) Find the greatest number of 5-digits which on being divided by 9, 12, 24 and 45 leaves 3, 6, 18 and 39 as remainders respectively.

(v) The length, breadth, height of a room are 6m 80 cm, 5m 10 cm and 3 m 40 cm respectively. Find the longest tape which can measure the dimensions of the room exactly.

ANS:

**II. **(i) 20

(ii) 20.25 cm

(iii) 9840

(iv) 99714

(v) 1 m 70 cm

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