Problems on H.C.F and L.C.M Questions

• The H.C.F. of 9⁄10, 12⁄25, 18⁄35 and 21⁄40 is:
• Find the greatest number that will divide 43, 91 and 183 so as to leave the same remainder in each case.
• 252 can be expressed as a product of primes as:
• The G.C.D. of 1.08, 0.36 and 0.9 is:
• The greatest number of four digits which is divisible by 15, 25, 40 and 75 is:
• The greatest possible length which can be used to measure exactly the lengths 7 m, 3 m 85 cm, 12 m 95 cm is:
• The L.C.M. of two numbers is 48. The numbers are in the ratio 2 : 3. Then sum of the number is:
• Find the highest common factor of 36 and 84.
• The least number which should be added to 2497 so that the sum is exactly divisible by 5, 6, 4 and 3 is:
• The ratio of two numbers is 3 : 4 and their H.C.F. is 4. Their L.C.M. is:
• Find the lowest common multiple of 24, 36 and 40.
• The smallest number which when diminished by 7, is divisible 12, 16, 18, 21 and 28 is:
• A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point?
• Reduce 128352/238368 to its lowest terms
• The least number which when divided by 5, 6 , 7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder, is:
• Three number are in the ratio of 3 : 4 : 5 and their L.C.M. is 2400. Their H.C.F. is:
• What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?
• The least multiple of 7, which leaves a remainder of 4, when divided by 6, 9, 15 and 18 is:
• The product of two numbers is 2028 and their H.C.F. is 13. The number of such pairs is:
• Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?