LCM and HCF
 H.C.F . of 2^{3}, 3^{2} and 15 is ?

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Clearly, 1 is the highest common factor of 2^{3}, 3^{2}, and 15.
Correct Option: C
Clearly, 1 is the highest common factor of 2^{3}, 3^{2}, and 15.
 H.C.F of 42, 63 and 140 is ?

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H.C.F. of 42 and 63 is 21.
∵ H.C.F of 21 and 140 is 7Correct Option: D
H.C.F. of 42 and 63 is 21.
∵ H.C.F of 21 and 140 is 7
∴ H.C.F. of 42, 63 and 140 is 7
 H.C.F of 1/2, 2/3, 3/4, 4/5 is ?

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H.C.F = ( H.C.F of 1, 2, 3, 4) / (L.C.M of 2, 3, 4, 5)
Correct Option: D
H.C.F = ( H.C.F of 1, 2, 3, 4) / (L.C.M of 2, 3, 4, 5)
= 1/60
 H.C.F. of 1485 and 4356 is ?

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H.C.F of 1485 and 4356 is 99
Correct Option: C
H.C.F of 1485 and 4356 is 99
 The largest number , which exactly divides 210, 315, 147 and 168 is ?

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The largest number is the H.C.F. of 210, 315, 147, and 168, which is 21.
Correct Option: C
The largest number is the H.C.F. of 210, 315, 147, and 168, which is 21.