LCM and HCF


  1. L.C.M of 3/4, 6/7, 9/8 is ?









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    L. C . M = ( L.C.M of 3, 6, 9 ) / (H.C.F of 4, 7, 8)

    Correct Option: A

    L. C . M = ( L.C.M of 3, 6, 9 ) / (H.C.F of 4, 7, 8)
    = 18 / 1
    = 18


  1. H.C.F . of 1/2, 3/4, 5/6, 7/8, 9/10 is ?









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    H.C.F = ( H.C.F of 1, 3 , 5, 7, 9) / (L.C.M of 2, 4, 6, 8 , 10)

    Correct Option: D

    H.C.F = ( H.C.F of 1, 3 , 5, 7, 9) / (L.C.M of 2, 4, 6, 8 , 10)
    = 1 / 120



  1. L.C.M of 33, 4, 42 and 3 is ?









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    L.C.M of 33, 4, 42 and 3 = L.C.M of 33 x 24

    Correct Option: C

    L.C.M of 33, 4, 42 and 3 = L.C.M of 33 x 24
    = 27 x 16
    = 432


  1. L.C.M of 87 and 145 is ?









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    H.C.F of 87 and 145 is 29
    ∴ L.C.M = ( 87 x 145) / 29

    Correct Option: C

    H.C.F of 87 and 145 is 29
    ∴ L.C.M = ( 87 x 145) / 29
    = 435



  1. Which of the following is a pair of co-primes ?









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    H.C.F . of 18 and 25 is 1
    So, 18 and 25 are co-primes

    Correct Option: B

    H.C.F . of 18 and 25 is 1
    So, 18 and 25 are co-primes